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Shikimic acid was shown to be a precursor of vitamin K(2) (MK-8) in Escherichia coli. 2. The benzene ring of the naphthaquinone arises from shikimic acid. 3. The methyl group of methionine is incorporated into vitamin K(2). 4. A scheme relating the biosynthesis of vitamin K(2) and ubiquinone to the general pathway of aromatic biosynthesis is proposed.
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Gb et al. (1966) studied this question.
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