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- One layer of specialized cells, iridiophores, glam up the octopus with iridescent blues & greens. These aren't pigments, but cells that contain specialized components which take in ambient light and refract only the blue spectrum.
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- The colours are attributed to iridiophores, and these, along with the cytoplasm and guanine layers in the fish's skin, have long been subject to research.
Iridiophore is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Iridiophore books and related discussion.
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