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1. Isolated perfused goat udders supplied with glucose, acetate and amino acids were infused for several hours with NaH(14)CO(3). 2. Lactose, milk-fat fatty acids and glycerol had very little radioactivity. The specific radioactivity (counts./min./mg. of C) of milk citrate was 9-16% that of the carbon dioxide in the perfusion fluid and 19% that estimated for tissue carbon dioxide. The specific radioactivity of tissue citrate resembled that of milk citrate. 3. The radioactivity in citrate was predominantly in C-6, suggesting some carboxylation of alpha-oxoglutarate in addition to carboxylation of C(3) compounds. 4. [1-(14)C]Glutamate was infused in a similar experiment, and milk citrate radioactivity was predominantly in C-1+C-5. 5. The results are discussed in relation to the contribution of glucose and acetate carbon to citrate. The implications of the carboxylation of alpha-oxoglutarate are considered.

THE INCORPORATION OF CARBON DIOXIDE INTO MILK CITRATE IN THE ISOLATED PERFUSED GOAT UDDER