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Ultrastructural comparison between mutant melanophores (a) and white pigment cells (b) in culture. Mutant melanophores in culture contained stage II melanosomes (m2), stage III melanosomes (m3), and few mature melanosomes. Cultured white pigment cells in the mutant contained stage II melanosomes (m2), stage III melanosomes (m3), and irregular-shaped reflecting platelets (asterisk). Few mature melanosomes were present in white pigment cells. Bar 1 μm
