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Fig. 2. Schematic illustrations of the water permeability barrier in relation to
the stratum corneum of the epidermis in four principal lineages of
vertebrates. The images on the left depict the morphology of generalized
integument, and drawings to the right illustrate the stylized arrangement of
barrier lipids (dark bars) in relation to horny layers of stratum corneum
(thin broken lines). The stratum germinativum is represented by the thick
broken lines. The features shown are not to scale.