Using analogy to understand how chameleons change colour

The video shows artificial models of the key structures in a type of cell called a melanophore. This is from a nice paper by Aoyama et alMelanophores and similar cells are how animals like chameleons change colour. The blobs that show up as bright here in the fluoresence microscopy images are actually dark brown under natural conditions. They contain eumelanin, the brown pigment that makes brown hair brown.

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