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Fig. 1. Generalized features of integument in four major clades of vertebrates.
and ß indicate alpha- and beta-type keratins, respectively. OG
and IG indicate outer and inner epidermal generations that might be present in
a squamate reptile prior to skin shedding. The mesos layer of squamates is a
specialized cell type derived from keratins and contains
extracellular, laminated lipids, comprising the principal water barrier in
these species.
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