Hormonal regulation of S100P. The variations of S100P under hormonal stimulations in primary endometrial cells (A: EEC, B: ESC). The upper column graph shows the mRNA changes of S100P detected by real-time PCR; the lower panel indicats the protein level variations of S100P detected by in-cell Western. The data were normalized to that of PE and used beta-actin as the internal reference. E: estrogen, P: progesterone, EP: estrogen combined with progesterone, blank: unstimulated.