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-Caseins Isolated from Milk Samples Typed ß-Casein A1 and A3
Eastern Utilization Research and Development Division, USDA, Philadelphia, Pennsylvania 19118
and Dairy Cattle Research Branch, Animal Husbandry Research Division, USDA, Beltsville, Maryland 20705
ABSTRACT
-Caseins A1 and A3 were isolated from cow milk typed A1 and A3 with respect to ß-casein. Disc gel electrophoretic patterns of
-A1, A2, A3, and B were compared with corresponding ß-casein patterns. The finding that the same relative spacings occur for the polymorphs of both
- and ß-caseins suggests that the amino acid substitutions which differentiate the ß-caseins also differentiate the
-caseins.
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