Wiktionary
n. (context protein English) Any protein, such as haemoglobin, that has a metal-containing pigmented group such as haem.
Wikipedia
A chromoprotein is a conjugated protein that contains a pigmented prosthetic group (or cofactor). A common example is hemoglobin, which contains a heme cofactor, which is the iron-containing molecule that makes oxygenated blood appear red. Other examples of chromoproteins include other hemochromes, cytochromes, phytochromes and flavoproteins.
In hemoglobin: chromoprotein ( tetramer MW:4 x 16.125 =64.500) Heme: Fe++ four pyrrol rings.
Usage examples of "chromoprotein".
More specifically, that melaninlike pigment that causes your skin to glow is photo-reactive under the aegis of a chromoprotein that absorbs at much longer wavelengths than those of the visual spectrum.
Coryf-dennen do it exclusively, using a chromoprotein closely related to visual pigment in animals.