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FIGURE 1. The time of melanin appearance in the eyes and melanophores in the periodic albino mutant is later than that of the wild type. (a–d) Stage 33/34 embryos; (e–h) stage 41 embryos; (i) adult frogs. Photographs of (c), (d), (g) and (h) are enlarged images of the head and trunk regions in (a), (b), (e) and (f), respectively. (a, c, e, g, i) Wild‐type Xenopus laevis; (b, d, f, h, i) mutant X. laevis. Melanin appears in the eyes (c, arrow) and melanophores (c, arrowheads) at stage 33/34 in the wild type (a, c), but not in the mutant (b, d). Small amounts of melanin begin to appear in the eyes (h, arrow) and melanophores (h, arrowheads) at stage 41 in the mutant (f, h). Although melanin‐containing cells do not disappear in the wild type even after metamorphosis, they almost disappear during metamorphosis in the mutant (i)
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