1.Granulocyte colony-stimulating factor in neutropenia management after CAR-T cell therapy: A safety and efficacy evaluation in refractory/relapsed B-cell acute lymphoblastic leukemia.
Xinping CAO ; Meng ZHANG ; Ruiting GUO ; Xiaomei ZHANG ; Rui SUN ; Xia XIAO ; Xue BAI ; Cuicui LYU ; Yedi PU ; Juanxia MENG ; Huan ZHANG ; Haibo ZHU ; Pengjiang LIU ; Zhao WANG ; Yu ZHANG ; Wenyi LU ; Hairong LYU ; Mingfeng ZHAO
Chinese Medical Journal 2025;138(1):111-113
2.Mechanism of Dahuang Tangluo Pills in Improving Renal Inflammatory Injury in Diabetic Kidkdey Disease by Regulating AGEs/RAGE/IKK/NF-κB Pathway
Pu ZHANG ; Jianqing LIANG ; Xia YANG ; Min BAI ; Xiangdong ZHU ; Chunxia XUE ; Beibei SU ; Yunhui ZHAO
Chinese Journal of Experimental Traditional Medical Formulae 2024;30(20):77-85
ObjectiveTo explore the protective effects of Dahuang Tangluo pills on early diabetic kidkdey disease (DKD) in db/db mice. MethodEight db/m mice were selected as the control group. Forty male db/db mice were selected and blood samples were collected via tail vein to measure fasting blood glucose (FBG). Mice with FBG ≥ 16.7 mmol·L-1, increased urine output, and persistent albuminuria were considered successful in model establishment. After successful modeling, they were randomly divided into a model group, a dapagliflozin group (1.5 mg·kg-1·d-1), and high, medium, and low dose groups of Dahuang Tangluo pills (3.6, 1.8, 0.9 g·kg-1·d-1, respectively), with eight mice in each group. All medication groups were administered orally, while the control and model groups were given an equal amount of distilled water by gavage daily. After continuous administration for 10 weeks, the survival status of the mice was observed, and their body weight, FBG, and kidney function-related indicators were measured. Inflammatory indicators in renal tissues were determined by enzyme-linked immunosorbent assay (ELISA). Hematoxylin-eosin (HE) staining, Masson staining, and electron microscopy were used to observe the pathological changes in renal tissues in each group. Immunofluorescence was employed to examine the expression of advanced glycation end products (AGEs) and receptors for advanced glycation end products (RAGE) proteins. Real-time quantitative polymerase chain reaction (Real-time PCR) and Western blot were utilized to detect the gene and protein expression levels of AGEs, RAGE, inhibitor of nuclear factor-κB (NF-κB) kinase (IKK), and NF-κB in the renal tissues of mice in each group. ResultCompared with control group, the model group showed a significant increase in body weight, FBG, serum creatinine (SCr), urinary microalbumin/urine creatinine ratio (ACR), total cholesterol (TC), and triglycerides (TG) (P<0.05). The levels of intercellular adhesion molecule-1 (ICAM-1), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) in renal tissues were significantly elevated (P<0.05). Renal histopathological staining and electron microscopy revealed loose arrangement, gaps, structural disarray, mesangial proliferation, and significant fibrosis in renal tissues. Real-time PCR results showed a significant increase in the expression of RAGE, IKK, and NF-κB genes in renal tissues (P<0.05). Immunofluorescence results demonstrated a significant increase in the expression of AGEs and RAGE proteins in renal tissues (P<0.05). Western blot results showed a significant increase in the expression of AGEs, RAGE, IKK, and NF-κB proteins in renal tissues (P<0.05). After drug intervention, compared with model group, the dapagliflozin group and the high-dose Dahuang Tangluo pills group showed significant reductions in body weight, FBG, SCr, and ACR (P<0.05), and a significant decrease in TC in mouse serum (P<0.05), while the high-dose Dahuang Tangluo pills group showed a significant decrease in TG in mouse serum (P<0.05). All treatment groups showed a significant reduction in ICAM-1, IL-6, and TNF-α in renal tissues (P<0.05). Renal histopathological staining and electron microscopy showed improved kidney injury, decreased collagen fiber deposition, and reduced mesangial proliferation in all treatment groups. Real-time PCR results showed a significant decrease in the expression of RAGE, IKK, and NF-κB genes in the dapagliflozin group and the high- and medium-dose Dahuang Tangluo pills groups (P<0.05). Immunofluorescence results demonstrated a significant decrease in the expression of AGEs and RAGE proteins in the dapagliflozin group and the high- and medium-dose Dahuang Tangluo pills groups (P<0.05). Western blot results showed a significant decrease in the expression of AGEs, RAGE, IKK, and NF-κB proteins in the dapagliflozin group and the high- and medium-dose Dahuang Tangluo pills groups (P<0.05). ConclusionDahuang Tangluo pills can improve the pathological structure of the kidneys and reduce renal inflammation in DKD mice, possibly through inhibiting the AGEs/RAGE/IKK/NF-κB pathway.
3.Research progress in regulation and mechanism of transcription factors on tanshinones
Yan-hong BAI ; Lin-lin XIN ; Ting ZENG ; Feng-xia HAN ; Yong-qing ZHANG ; Gao-bin PU ; Xue CHEN ; Qian LIU
Acta Pharmaceutica Sinica 2024;59(5):1218-1228
italic>Salvia miltiorrhiza, a commonly used traditional Chinese medicine, has been widely recognized for its blood-activating and stasis-removing properties in the clinical treatment of cardiovascular and cerebrovascular diseases. The synthesis and regulatory mechanism of tanshinones, the key active constituents of
4.Surgical treatment and prognosis analysis of hilar cholangiocarcinoma
Xiangcheng LI ; Changxian LI ; Hui ZHANG ; Feng CHENG ; Feng ZHANG ; Liyong PU ; Chuanyong ZHANG ; Ke WANG ; Lianbao KONG ; Xiaofeng QIAN ; Donghua LI ; Wenxiong LU ; Ping WANG ; Aihua YAO ; Jianfeng BAI ; Xiaofeng WU ; Ruixiang CHEN ; Xuehao WANG
Chinese Journal of Surgery 2024;62(4):290-301
Objective:To investigate the surgical treatment effect and prognostic factors of hilar cholangiocarcinoma.Methods:This is an ambispective cohort study. From August 2005 to December 2022,data of 510 patients who diagnosed with hilar cholangiocarcinoma and underwent surgical resection at the Hepatobiliary Center of the First Affiliated Hospital of Nanjing Medical University were retrospectively collected. In the cohort,there were 324 males and 186 females,with an age of ( M (IQR)) 63(13)years (range:25 to 85 years). The liver function at admission was Child-Pugh A (343 cases,67.3%) and Child-Pugh B (167 cases,32.7%). Three hundred and seventy-two(72.9%) patients had jaundice symptoms and the median total bilirubin was 126.3(197.6) μmol/L(range: 5.4 to 722.8 μmol/L) at admission. Two hundred and fourty-seven cases (48.4%) were treated with percutaneous transhepatic cholangial drainage or endoscopic nasobiliary drainage before operation. The median bilirubin level in the drainage group decreased from 186.4 μmol/L to 85.5 μmol/L before operation. Multivariate Logistic regression was used to identify the influencing factors for R0 resection,and Cox regression was used to construct multivariate prediction models for overall survival(OS) and disease-free survival(DFS). Results:Among 510 patients who underwent surgical resection,Bismuth-Corlett type Ⅲ-Ⅳ patients accounted for 71.8%,among which 86.1% (315/366) underwent hemi-hepatectomy,while 81.9% (118/144) underwent extrahepatic biliary duct resection alone in Bismuch-Corlett type Ⅰ-Ⅱ patients. The median OS time was 22.8 months, and the OS rates at 1-,3-,5-and 10-year were 72.2%,35.6%,24.8% and 11.0%,respectively. The median DFS time was 15.2 months,and the DFS rates was 66.0%,32.4%,20.9% and 11.0%,respectively. The R0 resection rate was 64.5% (329/510), and the OS rates of patients with R0 resection at 1-,3-,5-and 10-year were 82.5%, 48.6%, 34.4%, 15.2%,respectively. The morbidity of Clavien-Dindo grade Ⅲ-Ⅴ complications was 26.1%(133/510) and the 30-day mortality was 4.3% (22/510). Multivariate Logistic regression indicated that Bismuth-Corlett type Ⅰ-Ⅲ ( P=0.009), hemi-hepatectomy and extended resection ( P=0.001),T1 and T2 patients without vascular invasion (T2 vs. T1: OR=1.43 (0.61-3.35), P=0.413;T3 vs. T1: OR=2.57 (1.03-6.41), P=0.010;T4 vs. T1, OR=3.77 (1.37-10.38), P<0.01) were more likely to obtain R0 resection. Preoperative bilirubin,Child-Pugh grade,tumor size,surgical margin,T stage,N stage,nerve infiltration and Edmondson grade were independent prognostic factors for OS and DFS of hilar cholangiocarcinoma patients without distant metastasis. Conclusions:Radical surgical resection is necessary to prolong the long-term survival of hilar cholangiocarcinoma patients. Hemi-hepatectomy and extended resection,regional lymph node dissection and combined vascular resection if necessary,can improve R0 resection rate.
5.Surgical treatment and prognosis analysis of hilar cholangiocarcinoma
Xiangcheng LI ; Changxian LI ; Hui ZHANG ; Feng CHENG ; Feng ZHANG ; Liyong PU ; Chuanyong ZHANG ; Ke WANG ; Lianbao KONG ; Xiaofeng QIAN ; Donghua LI ; Wenxiong LU ; Ping WANG ; Aihua YAO ; Jianfeng BAI ; Xiaofeng WU ; Ruixiang CHEN ; Xuehao WANG
Chinese Journal of Surgery 2024;62(4):290-301
Objective:To investigate the surgical treatment effect and prognostic factors of hilar cholangiocarcinoma.Methods:This is an ambispective cohort study. From August 2005 to December 2022,data of 510 patients who diagnosed with hilar cholangiocarcinoma and underwent surgical resection at the Hepatobiliary Center of the First Affiliated Hospital of Nanjing Medical University were retrospectively collected. In the cohort,there were 324 males and 186 females,with an age of ( M (IQR)) 63(13)years (range:25 to 85 years). The liver function at admission was Child-Pugh A (343 cases,67.3%) and Child-Pugh B (167 cases,32.7%). Three hundred and seventy-two(72.9%) patients had jaundice symptoms and the median total bilirubin was 126.3(197.6) μmol/L(range: 5.4 to 722.8 μmol/L) at admission. Two hundred and fourty-seven cases (48.4%) were treated with percutaneous transhepatic cholangial drainage or endoscopic nasobiliary drainage before operation. The median bilirubin level in the drainage group decreased from 186.4 μmol/L to 85.5 μmol/L before operation. Multivariate Logistic regression was used to identify the influencing factors for R0 resection,and Cox regression was used to construct multivariate prediction models for overall survival(OS) and disease-free survival(DFS). Results:Among 510 patients who underwent surgical resection,Bismuth-Corlett type Ⅲ-Ⅳ patients accounted for 71.8%,among which 86.1% (315/366) underwent hemi-hepatectomy,while 81.9% (118/144) underwent extrahepatic biliary duct resection alone in Bismuch-Corlett type Ⅰ-Ⅱ patients. The median OS time was 22.8 months, and the OS rates at 1-,3-,5-and 10-year were 72.2%,35.6%,24.8% and 11.0%,respectively. The median DFS time was 15.2 months,and the DFS rates was 66.0%,32.4%,20.9% and 11.0%,respectively. The R0 resection rate was 64.5% (329/510), and the OS rates of patients with R0 resection at 1-,3-,5-and 10-year were 82.5%, 48.6%, 34.4%, 15.2%,respectively. The morbidity of Clavien-Dindo grade Ⅲ-Ⅴ complications was 26.1%(133/510) and the 30-day mortality was 4.3% (22/510). Multivariate Logistic regression indicated that Bismuth-Corlett type Ⅰ-Ⅲ ( P=0.009), hemi-hepatectomy and extended resection ( P=0.001),T1 and T2 patients without vascular invasion (T2 vs. T1: OR=1.43 (0.61-3.35), P=0.413;T3 vs. T1: OR=2.57 (1.03-6.41), P=0.010;T4 vs. T1, OR=3.77 (1.37-10.38), P<0.01) were more likely to obtain R0 resection. Preoperative bilirubin,Child-Pugh grade,tumor size,surgical margin,T stage,N stage,nerve infiltration and Edmondson grade were independent prognostic factors for OS and DFS of hilar cholangiocarcinoma patients without distant metastasis. Conclusions:Radical surgical resection is necessary to prolong the long-term survival of hilar cholangiocarcinoma patients. Hemi-hepatectomy and extended resection,regional lymph node dissection and combined vascular resection if necessary,can improve R0 resection rate.
6.Value of intravoxel incoherent motion diffusion-weighted imaging quantitative parameters in different regions of kidney in the diagnosis of IgA nephropathy
Xue ZHAI ; Pu CHEN ; Shaopeng ZHOU ; Xu BAI ; Jian ZHAO ; Yong WANG ; Li ZHANG ; Guangyan CAI ; Song WANG ; Haiyi WANG
Chinese Journal of Radiology 2024;58(6):640-646
Objective:To explore the value of intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) parameters in different regions of the kidney in distinguishing IgA nephropathy (IgAN) patients from healthy volunteers.Methods:This study was a cross-sectional study. Eighty-four patients diagnosed with IgAN (IgAN group) who underwent renal biopsy (lower pole of the left kidney) and were pathologically confirmed at the First Medical Center of PLA General Hospital from February 2022 to September 2023 and thirty-four healthy volunteers (control group) were included prospectively. The regions of interest were outlined in the right renal cortex, medulla, and parenchyma for all subjects, and the apparent diffusion coefficient (ADC), true diffusion coefficient (D), pseudo-diffusion coefficient (D *), and perfusion fraction (f) were measured in the corresponding regions. The differences in IVIM-DWI parameters between the IgAN group and the control group were compared using the student′s t-test or the Mann-Whitney U test. Receiver operating characteristic curve analysis was performed on the parameters with statistically significant differences, and the area under the curve (AUC) was calculated. Results:There were statistically significant differences in renal cortical ADC, renal parenchymal ADC, renal cortical D, renal parenchymal D, and renal medullary f values between the IgAN group and the control group ( Z=-3.03, -2.21, -2.62, -2.03, -2.03; P=0.002, 0.027, 0.009, 0.043, 0.042). The AUCs (95% CI) for diagnosing IgAN using renal cortical ADC, renal parenchymal ADC, renal cortical D, renal parenchymal D, and renal medullary f values were 0.679 (0.586-0.762), 0.630 (0.537-0.717), 0.654 (0.535-0.774), 0.619 (0.497-0.742), and 0.620 (0.495-0.745), respectively. There were no statistically significant differences in renal medullary ADC, D, renal cortex, medulla and parenchyma D *, renal cortical and renal parenchymal f values between the two groups ( P>0.05). Conclusion:The quantitative parameters of renal IVIM-DWI are influenced by different measurement regions, among which the ADC, D of renal cortex and parenchyma, and f of renal medulla can be used for the initial diagnosis of IgAN.
7.Association between suicidal ideation and exposure to socialecological risk factors among middle school students in Taiyuan City
PU Xin, YONG Zhongtian, WANG Kai, WANG Liyan, CHEN Jin, WANG Li, BAI Tao
Chinese Journal of School Health 2023;44(10):1527-1531
Objective:
To understand the current situation of suicidal ideation among middle school students in Taiyuan City and its correlation with exposure to social ecological risk factors, so as to provide a reference basis for exploring the causes of suicidal ideation among middle and high school students and formulating effective preventive measures.
Methods:
A questionnaire survey was conducted among 2 639 middle school students in urban and rural areas of Taiyuan City by multistage stratified random cluster sampling, including general demography characteristics, social ecological risk factors and suicidal ideation. SPSS 26.0 software was used for Chi squared test and binary Logistic regression analysis.
Results:
The overall detection rate of suicidal ideation was 24.7 %. There were statistically significant differences in the detection rate of suicidal ideation among middle school students in different gender, grade, family residence, maternal education level, perceived family economic conditions, number of close friends, self-perceived academic burden ( χ 2=38.17, 13.44, 10.77, 8.15, 19.76, 18.95, 59.75, P <0.05). After adjusting the general demography characteristics, the binary Logistic regression showed that moderate and high risk in the individual, family and cultural dimension, and high risk in the school dimension of the social ecology were all positively correlated with suicidal ideation among middle school students ( OR=1.38, 2.28, 1.97, 3.28, 1.48, 2.15, 1.71, P <0.05).
Conclusion
The suicidal ideation among middle school students is related to individuals, families, and schools in the social ecological microsystem, as well as the cultural environment in the macro system. It is necessary to conduct intervention in suicidal ideation at the individual, family, and school levels, meanwhile, strengthening social and cultural construction to reduce the impact of adverse factors on the mental health among adolescents.
8.The role of intravoxel incoherent motion diffusion-weighted imaging in distinguishing diabetic nephropathy from non-diabetic renal disease in diabetic patients
Shaopeng ZHOU ; Qian WANG ; Xue ZHAI ; Pu CHEN ; Jian ZHAO ; Xu BAI ; Xiaojing ZHANG ; Lin LI ; Huiyi YE ; Zheyi DONG ; Xiangmei CHEN ; Haiyi WANG
Chinese Journal of Internal Medicine 2023;62(11):1288-1294
Objective:To investigate the intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI) in the differential diagnosis of diabetic nephropathy (DN) and non-diabetic renal disease (NDRD) among patients with type 2 diabetes mellitus (T2DM).Methods:A diagnostic test. In this prospective study, patients with T2DM who underwent both IVIM-DWI and renal biopsy at the First Medical Center of Chinese PLA General Hospital between October 2017 and September 2021 were consecutively enrolled. IVIM-DWI parameters including perfusion fraction (f), pure diffusion coefficient (D), and pseudo-diffusion coefficient (D*) were measured in the renal cortex, medulla, and parenchyma. Patients were divided into the DN group and NDRD group based on the renal biopsy results. IVIM-DWI parameters, clinical information, and diabetes-related biochemical indicators between the two groups were compared using Student′s t-test or Mann-Whitney U test. The correlation of IVIM-DWI parameters with diabetic nephropathy histological scores were analyzed using Spearman′s correlation analyzes. The diagnostic efficiency of IVIM-DWI parameters for distinguishing between DN and NDRD were assessed using the receiver operating characteristic (ROC) curves. Results:A total of 27 DN patients and 23 NDRD patients were included in this study. The DN group comprised 19 male and 8 female patients, with an average age of 52±9 years. The NDRD group comprised 16 male and 7 female patients, with an average age of 49±10 years. The DN group had a higher D* value in the renal cortex and a lower f value in the renal medulla than the NDRD group (9.84×10 -3 mm 2/s vs. 7.35×10 -3 mm 2/s, Z=-3.65; 41.01% vs. 46.74%, Z=-2.29; all P<0.05). The renal medulla D* value was negatively correlated with DN grades, interstitial lesion score, and interstitial fibrosis and tubular atrophy (IFTA) score ( r=-0.571, -0.409, -0.409; all P<0.05) while the renal cortex f value was positively correlated with vascular sclerosis score ( r=0.413, P=0.032). The renal cortex D* value had the highest area under the curve (AUC) for discriminating between the DN and NDRD groups (AUC=0.802, sensitivity 91.3%, specificity 55.6%). Conclusion:IVIM-derived renal cortex D* value can be used non-invasively to differentiate DN from NDRD in patients with T2DM that can potentially facilitate individualized treatment planning for diabetic patients.
9.Changes of serum CTX-1 and P1NP in patients with skeletal fluorosis in tea-drinking-borne endemic fluorosis area in Qinghai Province
Guanglan PU ; Yaqian ZHAO ; Qiang ZHANG ; Qing LU ; Ping CHEN ; Mingjun WANG ; Shenglu BAI ; Hong JIANG ; Peichun GAN ; Xin ZHOU ; Cuiling LA ; Shengying WEI ; Xianya MENG
Chinese Journal of Endemiology 2023;42(2):106-110
Objective:To observe the changes of serum C-terminal peptide of type Ⅰ collagen (CTX-1) and N-terminal lengthening peptide of type Ⅰ collagen (P1NP) in adult patients with skeletal fluorosis in the tea-drinking-borne endemic fluorosis area in Qinghai Province, and to find sensitive indicators for diagnosis of skeletal fluorosis.Methods:From April to August 2019, a case-control study was carried out in tea-drinking-borne endemic fluorosis area in Zhiduo County, Yushu Tibetan Autonomous Prefecture, and Gangcha County, Haibei Tibetan Autonomous Prefecture of Qinghai Province. According to the Diagnostic Standard for Endemic Skeletal Fluorosis (WS/T 192-2008), the clinical diagnosis and X-ray examination of skeletal fluorosis were carried out for permanent residents ≥25 years old and living for more than 10 years in the area, combined with face-to-face inquiry and investigation of past disease history, lifestyle and clinical manifestations. The patients with skeletal fluorosis and healthy people were selected as skeletal fluorosis group and control group, respectively. Randomized urine samples and fasting venous blood from the two groups were collected. The content of fluoride in urine was determined by ion selective electrode method, and the contents of CTX-1 and P1NP in serum were determined by enzyme-linked immunosorbent assay (ELISA).Results:A total of 127 people in the disease area were investigated, including 63 cases in skeletal fluorosis group and 64 cases in control group. There was no statistically significant difference in age and sex ratio between the two groups ( t = 0.42, χ 2 = 0.07, P > 0.05). The X-ray examination results showed that the patients with skeletal fluorosis were mainly mild, accounting for 71.43% (45/63); X-ray changes were mainly ossification of interosseous membrane and tendon. The urinary fluoride in control group and skeletal fluorosis group was 1.62 (1.12, 1.95) and 3.22 (2.38, 4.89) mg/L, respectively, with statistically significant difference between the two groups ( Z = 7.07, P < 0.001). The difference of serum CTX-1 and P1NP contents between the two groups was statistically significant ( Z = 2.00, 4.89, P < 0.05). Conclusions:The levels of serum CTX-1 and P1NP in patients with skeletal fluorosis are higher than those in healthy people. Serum CTX-1 and P1NP may be used as sensitive indicators for diagnosis of skeletal fluorosis.
10.To Explore the Mechanism of Icariin Combined with Prednisone on Steroid-Resistant Nephrotic Syndrome Based on Network Pharmacology and Experimental Verification
Juan LYU ; Enlai DAI ; Yunxia ZHANG ; Junyuan BAI ; Xiaowei PU
World Science and Technology-Modernization of Traditional Chinese Medicine 2023;25(7):2426-2436
Objective Based on network pharmacology,molecular docking and animal experiment,this study explored the mechanism of Icariin combined with Prednisone in the treatment of steroid-resistant nephrotic syndrome(SRNS)in rats.Methods The targets of Icariin active components were determined by TCMSP,GeneCards and CTD databases.The targets of SRNS were screened from GeneCards,OMIM,CTD and DRUGBANK databases,Remove and integrate.Venn graph was drawn to obtain the intersection target.A protein-protein interaction network was constructed using STRING database,and core targets were screened by topological analysis using Cytoscape 3.7.2.DAVID 6.8 was employed for GO term enrichment and KEGG pathway enrichment.And AutoDockTools Vina,PyMOL for molecular docking.SRNS rat model was constructed.The body weight of rats was measured,The 24-hour urinary protein quantity was detected,and the pathological morphology of renal tissue was observed by HE staining.,and the expression of core target proteins was de tected by Western blot.Results Network pharmacologic analysis showed that 139 targets corresponding to Icariin active ingredients were obtained,and 58 common targets were obtained by intersection with 1476 SRNS related targets.In PPI network,the top three degree values were Akt,JUN and IL6.KEGG enrichment analysis showed that Icariin played a therapeutic role in SRNS mainly by PI3K/AKT singnaling pathway.Molecular docking verification showed that Akt,PI3K and autophagy-related protein LC3-II had good binding activity with Icariin.Animal experiment result showed that Icariin combined with Prednisone significantly increased the body weight of SRNS rats(P<0.05),decreased the 24 hour urine protein quantity(P<0.01),and improved the glomerular morphological changes.The results of Western-blotting showed that Icariin combined with Prednisone could significantly improve the abnormal decrease of LC3-II protein and the abnormal increase of Akt and PI3K protein expression in renal tissue of SRNS rats(P<0.01).Conclusion Icariin can play a role in the treatment of SRNS through a multi-target and multi-pathway,regulate the PI3K-Akt signaling pathway,and increase the autophagy activity of kidney tissue in SRNS rats,which may be one of its main mechanisms.


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