Abstract —Cortex slices of rat brain were incubated with glucose mixed‐labelled with 3H and 14C in the 6‐position and the 3H/14C ratios of lactate, acetate, citrate and acetylcholine were determined. The values obtained were: lactate 0·95, acetate 0·85, citrate 0·65 and acetylcholine 0·67 when expressed in relation to a glucose 3H/14C ratio of 1·00. When brain slices were incubated with [2‐14C, 2‐3H]acetate in the presence of unlabelled glucose, labelled acetylcholine was formed with a 3H/14C ratio not significantly different from the labelled substrate. The results indicate that citrate is a precursor to the acetyl moiety of acetylcholine.
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Sollenberg et al. (1970) studied this question.
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