[Isolation of immunoglobulin G--marker of normal growth in the blood of the rat].

The blood of rats with a regenerating liver and of pregnant animals is found to contain a peculiar subfraction of immunoglobulin G (IgG) which is absent in the blood of control animals. A characteristic feature of the protein which permits its detection among other proteins of this class, is its ability to form a complex with serum alpha-globulins insoluble… (More)