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Fig. 13 Abnormal chromatophore morphology phenotypes (Class VII). Wild-type siblings (A,G) are compared with heterozygous tin (B), homozygous tin (C), heterozygous pet (E), homozygous pet (F), and homozygous sas (D,H) and uni (I) mutants on the third day (A-F) and the sixth day (G-I). Melanophores are pale and spindly (tin/+, B) or spot-like and uni- or bipolar (tin/tin, C) in tin mutants. Melanophores are pale (pet/+,E) or pale and spindly, but multipolar (pet/pet, F) in pet mutants. sas mutants show small, stellate melanophores with a pale central area (arrowhead, D,H). Melanophores remain small on the sixth day, and xanthophores now have a similar phenotype (arrow, H). uni mutants share the melanophore phenotype (arrowhead, I), but xanthophores are unaffected (I). A-F are dorsolateral views of yolk sac melanophores; G-I are dorsal views of head dorsal stripe. Scale bars, 60 μm (A-F) and 100 μm (G-I).