Epidermal sheets were prepared as before4 (link) with slight modification. Briefly, ears were split into dorsal and ventral halves with forceps. Thioglycolic acid-containing Hair Removing Body Cream Epilat (Kracie) was used to remove hair in some experiments. Ear halves were incubated for 15 minutes at 37°C on 3.8% ammonium thiocyanate (Wako Pure Chemical Industries) in phosphate buffer (pH 7.0). Epidermal sheets were manually detached from the dermis under a dissecting microscope (Olympus).