This study was established in serum free condition. The effects of epidermal growth factor (EGF),bovine pituitary extract (BPE), and ethanolamine (Etha) on the DNA synthesis of human epidermal cells were determined by thymidine incorporation.

• 采用无血清培养系统，以3H－TdR掺入法测定表皮生长因子（EGF）、牛垂体提取物（BPE）和乙醇胺（Etha）对人表皮细胞DNA合成的影响。