5、nductionontheexpressionofestrogenandprogesteronereceptorsandtheirmRNAinthemidluteumendometriumWANGYing,CHENYong-Jian,LIMei-Zhi,ZHANGXiao-Wei,WANGAi-Ming (DepartmentofObstetricandGynecology,PekingUniversityThirdHospital,Beijing 100083,China) ABSTRACT O