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Effect of yohimbine on melanophore pigment dispersal in freshwater sticklebacks. Photograph of the flank of a freshwater fish before (A) and after (B) immersion in yohimbine to induce pigment dispersal. Arrowheads point to the same three melanophores in both panels. Melanophore size is similar across dark and light bars following pigment dispersal, but the level of pigment is lower in melanophores from light bars (see Results for details).
