Fig. 5. Alterations in epidermis, aberrant hair follicle morphogenesis and hair cycling in grafts of p107/p130-null epidermis. Increased number of hair follicles in p107/p130-doubly deficient mice grafts (A,A') compared with controls (B) was evident 4 weeks after transplantation. In addition, a number of abnormalities, including epidermal hyperplasia and parakeratosis (C), dysplastic hairs sharing a unique hair canal (D), misoriented follicles (arrow in E), follicular cysts (arrows in F), and hyperplasic sebaceous glands (G) were commonly detected in p107/p130-doubly deficient grafts. Transplants from p107/p130-deficient skin almost exclusively displayed anagen hair follicles at 2 (H) and 3 (I) weeks after transplantation. Eight weeks after transplantation, control grafts (J) display most of the hair follicles in a resting telogen phase (see inset, right), while in p107/p130-deficient grafts (K), the vast majority of hair follicles persisted in anagen (see inset, right). Scale bars: 500 µm in A,A'; 1 mm in B,H-K; 100 µm in C-G. Brackets in H and J indicate the wound margin.