“…Further examples of a columnar organization ( Fig. i) have been demonstrated in the epidermis ofthe hairless (hr/hr) mouse (Karatschai et al^ 1971), frog (Komnick & Stockum, 1970), chicken (Mackenzie, 1975a), hamster (Mackenzie, Zimmerman & Wheelock, 1975), and monkey (Menton & Eisen, 1971;Mackenzie & Linder, 1973;Mackenzie, Zimmerman & Peterson, 1981). The timings ofthe first appearance ofthe columnar structure in neonatal rat epidermis were followed by Mackenzie & Zimmerman (1981).…”