Bulge stem cells in mouse follicles may be pluripotential, i.e., responsible not only for development of the follicle, but for sebaceous glands and epidermis, too.

Sebaceous units, i.e., lobules and ducts, derive from mantle epithelium that emanates from the junction of infundibulum and isthmus at some distance from "the bulge."

Epidermal epithelium is reconstituted after loss of it from epithelial cells contributed by the upper portion of follicles, i.e., infundibula and eccrine ducts. Eccrine ducts and infundibula are unassociated with bulges.