Abstract
Strain variations in the migration of the S γ1 globulin of mice have been demonstrated by immunoelectrophoresis. The variation of electrophoretic mobility seems to have a hereditary basis and was not accompanied by any detectable antigenic dissimilarity. The fast migration of the CBA 7 S γ1 was presumably not due to to the presence of sialic acid. Papain digestion of the 7 S γ1 from a strain of mice with 7 S γ1 of fast mobility (CBA) and a strain with slow mobility (C57BL/6) showed that both the F c and the F ab pieces migrated at rate similar to the parent molecule. In addition, the F c piece of the 7 S γ1 was seen to migrate faster than the F c piece of the 7 S γ2 globulin.
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