(d)The distribution of the 14C label in -carotene becomes evident once its isoprene units areidentified.26.16The carbon chain of prostacyclin is derived from acetate by way of a C20fatty acid. Trace a contin-uous chain of 20 carbons beginning with the carboxyl group. Even-numbered carbons are labeledwith 14C when prostacyclin is biosynthesized from 14CH3CO
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