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L'homocysteine est un acide amine soufre qui est soit methyle en methionine soit transforme en cystathionine et cysteine par la voie de la transsulfuration dependant de la vitamine B 6 . La premiere voie a pour cofacteur la vitamine B 12 et utilise comme donneur de methyle soit un derive de l'acide folique, le N5-methyltetrahydrofolate, soit la betaine. La remethylation et la...
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