As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
In this paper the news hypothesis of structure of arthropods hemocyanin were presented. One also particulary discussed the constitution of this proteins components. The heterogeneity Hc on the level of polypeptide chains was considerated. The function performed by respective subunits (chains) in the constitution of bigger hemocyanins aggregates was attempted.