Abstract
The pretreatment of rat liver mitochondrial fractions with phospholipase C preparations enhanced the incorporation of cytidine diphospho-[ 14C]-choline into phospholipids several-fold. Similar pretreatment of the microsomal fraction produced a similar stimulation. When the extent of microsomal contamination in the mitochondria was determined, and increments of pretreated microsomes were added to the mitochondria, the incorporation values extrapolated to zero for zero microsomal contamination. It was concluded that lecithin biosynthesis from endogenous diglycerides in the mitochondrial fractions could be ascribed to contaminating microsomes.
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