... of Biologists 1990 human hair follicles organ maintenance growth factors The hair follicle is composed of epithelial components (the matrix and outer root sheath) and dermal components (the dermal papilla and connective tissue sheath). Hair growth, which is effected by the division of the hair...

.... This study shows that human sebocytes continue to divide on organ maintenance, but that they do not differentiate fully. However, this provides the first demonstration that 13-cis-retinoic acid acts on human sebaceous glands directly, reducing the rate of cell division and the rate of lipogenesis, which...

... supports. They retain their viability as determined by: (1) ATP, ADP and AMP contents; (2) their rates of DNA and protein synthesis; (3) [ methy - 3 H] thymidine autoradiography; and (4) their pattern of keratin synthesis. However, during organ maintenance the follicles develop morphological changes...