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Fig. 11 'Epidermalised' endoderm. Detail of the ?epidermalised' endodermal epithelium (arrowheads) in the roof of the pharyngeal cavity (A, B) and of the ectodermal epithelium of the skin (C, D) in Acipenser ruthenus (A, C) and Ambystoma mexicanum (B, D). Note similarities in differentiation of the superficial cells. Scale bars = 25 ?m.
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Full text @ Biol. Rev. Camb. Philos. Soc.