Adult virgin female mice were killed at each stage of the estrous cycle. The mid pieces of uteri were taken and fixed in 4% neutral formaldehyde, and stained with 0.5% toluidine blue at pH 0.5. It was found that mast cells in uterus were mainly distributed in the myometrium, only a few in the endometrium. The mast cell number was maximum in metestrus and minimum in proestrus, and this difference was highly significant (P

Recently,as the exposure of the incident of‘octuplet’in Guangdong province,China's underground surrogate market has once again surfaced and led to a wide range of discussion.In this paper,the connotation and characteristics of surrogacy were analyzed and related laws and regulations of surrogacy in foreign countries were discussed.The main types of surrogacy-related legislation and regulations abroad are autonomy of private law,governmental regulation and complete prohibition.This paper carried out thorough legal analysis on whether to prohibit strictly or establish an authoritative legal system in view of the existing and ineffectively prohibited underground surrogate market in our country.