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Fig. 2. Homozygous rk4 flies show delayed post-ecdysial tanning. Photomicrographs show the dorsal abdominal cuticle dissected from (A) wild-type males or (B) females and (C) rk4homozygous males or (D) females at 3 h after eclosion. Cuticles are mounted to show the extent of melanization.