English: An illustration of a female Doryteuthis opalescens squid that switches a white stripe on its mantle from nearly transparent (left) to opaque white (right). (Inset, left) An illustration of a cross-section of the white stripe that shows the epidermis, chromatophore layer, leucophore layer, and underlying muscle. (Inset, middle left) An illustration of a leucophore, wherein the membrane contains an embedded arrangement of proteinaceous structures called leucosomes. The arrangement enables the cell to diffusely reflect, i.e. scatter, visible light. (Inset, middle right) An illustration of a leucosome, which contains assembled reflectin proteins. (Inset, right) A generalized illustration of a reflectin isoform.^[1]