Abstract

1. 1. The manner of utilization of fatty acids of exogenous and endogenous origin by sheep adipose tissue preparations in vitro has been studied. 2. 2. Palmitic, stearic and oleic acids were esterified at comparable rates and triacylglycerols were the main lipid class formed. 3. 3. Fatty acids synthesized de novo from acetate were esterified to different lipid classes in a manner resembling that of exogenous fatty acids regardless of the initial acetate concentration. 4. 4. Palmitic and stearic acids were the principal fatty acids synthesized de novo but the proportions were affected by acetate concentration and by whether exogenous unesterified fatty acids were present. 5. 5. The distributions of fatty acids among the three positions of the triacyl- sn-glycerols varied according to the origin of the fatty acid supplied and were somewhat different from the natural distributions.

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