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In this study we tested the hypothesis that red blood cell 5-methyltetrahydrofolate, a long-term marker of the folate status, is associated with the severity of coronary artery disease and whether this association is independent of homocysteine, vitamin B12, plasma 5-methyltetrahydrofolate, 5,10-methyltetrahyrofolate reductase C677T genotype, and other cardiovascular risk factors. Two hundred and...