Hemocyanins are copper-containing respiratory pigments found in many mollusks (some bivalves, many gastropods, and cephalopods) and arthropods (many crustaceans, some arachnids, and the horseshoe crab, Limulus).

Do humans have hemocyanin?

The human version of the respira- tory pigment is called hemo- globin, and the crab version is called hemocyanin. In hemoglobin, when iron binds to oxygen, it absorbs mostly blue light, so it appears bright red.

Is haemocyanin present in chloroplast?

Answer: haemocyanin pigment is not present in chloroplast.