毛发生长中期

However, hair follicles that are in catagen or telogen growth phases are less pigmented. 但是，毛囊处于退行期和休止期增长阶段不太色素。

In catagen, the staining of LEF-1 became weaken obviously, and disappeared in ORS. 退化期,LEF-1表达明显减弱，毛母质中弱表达，外根鞘内表达消失；

Conclusion hair growth lotion can promote the growth of hair follicle by inhibiting the appearance of catagen. 结论：生发液能够延缓器官培养毛囊的退化期出现而延长生长期，促进毛囊长度的增长。

Conclusion It is suggested that EGF might stimulate the growth of hair follicle epithelium, and induce anagen transforming into catagen prematurely. 结论EGF对毛囊的生长有促进作用，主要是促进毛囊上皮的生长，并且诱导毛囊提前由生长期进入退行期。

The secondary follicles finish the reconstruction from August to September, and most of them enter into catagen in October. 10月份毛球细胞停止分裂，毛乳头萎缩，大量细胞程序化死亡，毛根上移，毛囊进入退行期；