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Pulse labelling experiments with [methyl-13C]S-adenosylmethionine (SAM) had previously shown that during the biosynthesis of vitamin B12, the fourth C-methylation site is C-17; new inverted pulse studies show that the remaining four SAM-derived methyl group are introduced in the order 12, 1, 15, 5.
H. C. Uzar and A. R. Battersby, J. Chem. Soc., Chem. Commun., 1985, 585 DOI: 10.1039/C39850000585
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