120 Morioka et al. Fig. 5. Co-localization of non-muscle myosin and actin in the outer root sheath. Bars100 m. Panels A, D and G show sections of vibrissal fol- licles stained with hematoxylin-eosin. Panels B, E, H and panels C, F, I represent immunostaining using anti-myosin antibody (BT561) and anti-actin antibody (C4) respectively. Each set of panels, (A, B, C), (D, E, F) and (G, H, I), consists of adjacent sections. HS, hair shaft; IRS, inner root sheath; ORS, outer root sheath; BM, basement membrane; DS, dermal sheath; Sn, sinus; Cs, capsule; *, the extension of the epidermal basal layer. a special cytoskeletal function when they enter into the hair bulb, because they undergo drastic morphological change at that point [18]. But once they have succeeded in invagina- tion, they appear to be relaxed. Therefore, we speculate that