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Diagram of cephalopod skin detailing the three main skin structures (chromatophores, iridophores and leucophores), two example states (a,b) and three distinct ray traces (1, 2, 3) show the sophisticated means by which cephalopods can change reflective colour. (c) (i) Cuttlefish skin, showing leucophores (white), chromatophores (yellow, red dark brown) and iridophores (green); (ii) squid skin, showing chromatophores and iridophores.
