Chromatophores

Fluorescent chromatophores can be found in the skin (e.g. in fish) just below the epidermis, amongst other chromatophores.

An equatorial circulet of seven large yellow-brown chromatophores is present on the mantle.

Chromatophores are colored pigment cells that expand and contract in accordance to produce color and pattern which they can use in a startling array of fashions.

Chromatophores cannot survive outside their host.

Chromatophores contain yellow, orange, red, brown, or black pigments; most species have three of these colors, while some have two or four.

Chromatophores have transferred much less of their DNA to the nucleus of their host.

Chromatophores While most chloroplasts originate from that first set of endosymbiotic events, Paulinella chromatophora is an exception that acquired a photosynthetic cyanobacterial endosymbiont more recently.

Comparisons with their closest free living cyanobacteria of the genus Synechococcus (having a genome size 3 Mb, with 3300 genes) revealed that chromatophores underwent a drastic genome shrinkage.

In fish and frogs, colour change is mediated by the type of chromatophores known as melanophores that contain dark pigment.