Objective To observe the expressing features of EGF and PCNA and study their roles during the development of human fetal testis.

• 目的观察表皮生长因子(EGF)与细胞增殖核抗原(PCNA)在人胎儿睾丸发生过程中的表达特征,探讨两者在睾丸发生中的作用。