In order to assess whether there is any abnormality in oncogene expression in hypoxia induced pulmonary hypertension, the expression of oncogene erbB in the lung tissue of rats with and without hypoxia was detected by in situ hybridization with digoxingenin as a prob label. The results showed that there was a slight expression of erbB mRNA in control normoxic rats. After hypoxia for 7 to 21 days, its expression increased significantly as compared with that in control (P
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