DIFFERENTIATION AND PROTEIN SYNTHESIS 



89 



eratinlzed dome 

 of inner root sheath 



mal papilla 



%@P 



Fig. 40. The hair cycle in the rat : (a) the commencement of growth in a 



follicle containing a club hair; (b), (c) and (d), stages leading to full 



growth; (e) and (f), cessation of growth. Reproduced by permission 



(Johnson, 1957). 



