退行期

退行期开始时，毛囊峡部、茎部和球部外毛根鞘内出现程序性死亡（Programmeddeath）细胞，即凋亡细胞（apoptoticcell）。

There are programmed death cells ( apoptotic cell ) in isthmus , petiol and glomus of external root sheath of hair follicle when regressive phase begins .

结论LM、FN在毛囊的生长期、退行期及休止期的表达随毛囊生长周期而发生周期性变化，LM、FN可能参与毛囊生长周期的调节。

Conclusion The difference between LM and FN expression in hair growth cycle indicates that LM and FN may play important roles in the regulation of human hair follicle growth cycl .

在哺乳动物的一生中，毛囊反复周期性地经历生长期、退行期和休止期的过程。

Hair growth cycle may divide into the vegetal period , draw back the departure date and stops the time three stages in a lifetime of mammal .

mL-1EGF可促进毛囊外根鞘细胞分化，并诱导毛囊由生长期提前进入退行期。10ng。

20 ng · mL ~ ( - 1 ) EGF could accelerate the differentiation of external root sheath cell in the hair follicle , and induce hair follicle to enter recessing period from growing period ahead of time .