Gc subtyping by isoelectric focusing and routine conventional electrophoresis demonstrated six new variants (mutants): Gc1C16, Gc1C23, Gc1C25, Gc2A12, Gc2A13, and Gc2C7. The variants were confirmed by the acknowledged Gc Reference Laboratories of Drs. J. Constans and H. Cleve. Gc1C16, Gc1C23, and Gc2A12 are tentative variants due to absence of family data to confirm their heritability.