which organ is responsible for producing most of the plasma protein
The globulin proteins include enzymes, protein carriers, and gamma globulin, or antibodies, something the body produces to fight infection and disease. While most plasma proteins are made in the liver, gamma globulins are made by lymphocytes called plasma cells. Globulins fall into one of four groups based on their size and electrical charge: gamma, beta, alpha-1 and alpha-2.