Hemocyanins are copper-containing oxygen carriers occurring freely dissolved in the hemolymph of many mollusks and arthropods. 36-chain polymer consisting of 6 hexamers, each of which includes 4 different chains, A, B, C and D. Hemolymph. Belongs to the tyrosinase family. Hemocyanin subfamily. PubMed:12823556 conflicts between the peptide sequence obtained by Edman degradation and that obtained from the cDNA sequence may be due to contamination of the peptide sample with hemocyanin D.