Proteins are the major macromolecules in the living system being responsible for all processes of life including respiration, digestion, growth and reproduction, defense, visualization, signal transduction and cellular communication etc. Hemocyanins are oxyphoric blue copper-containing respiratory proteins present in the hemolymph of many species of arthropod and mollusc. Scorpion hemocyanin is composed of 24 monomeric subunits assembled in four hexameric blocks. It contains eight different types of polypeptide chains present in two or four copies within the native molecule. The first chapter...