Melanophore Aggregation-Dispersion Response to the Change of Background Color. Melanosome aggregation-dispersion in response to a rapid succession of background color change was measured. The upper panels show the responses of melanophores in the trunk of wild-type (WT) fish, and the lower panels show that of mutant fish (obetc271d). The left panels depict the usual state (black background), the middle panels depict melanophores after being sustained for 3 min in a white (light) background, and the right panels depict melanophores after 3 min in a black (dark) background. The wild-type melanophores responded normally to the change of background color (n = 6), whereas mutant fish (jagb230 and obetc271d) melanophores strongly responded to the change of background color from black to white but did not respond to the change from white to black (n = 9 for all).
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