Ultracentrifugation and gel electrophoresis, powerful techniques of physical chemistry
in the late 1930s, revealed that serum antibodies were identified in the gamma globulin fraction of blood pro- teins, the so-called gamma immunoglobulins (IgGs).
[Cambridge histories online] Lindberg, D.C._Numbers, R.L._Bowler, P.J._Porter, R._Nye, M.J._Pickstone, J.V._Park, K._Daston, L._Ross, D._Porter, T.M. - The Cambridge History of Science_ Volume 6, The Modern Biological and Earth Sc - libgen.
