Fig. 1
From: Melatonin promotes the development of the secondary hair follicles by regulating circMPP5
Proliferation and development of hair follicles in fetal and newborn cashmere goats. 45–75 d post conception: proliferation and development of primary hair follicles. 75–125 d post conception: adjacent structures appear; proliferation and development of secondary (cashmere) hair follicles, initiation of primary fibre production. 125 d post conception to birth: secondary hair follicles continue to proliferate; some cashmere fibre production. Birth to 6 months of age: the key period of secondary hair follicle growth