Abstract

In the December 11, 2007, issue of PNAS, Selhub et al. (1) suggest that the association between elevated serum folate and methylmalonic acid (MMA) concentrations in vitamin B12 deficiency resulted from disruption of MMA metabolism by folate. An alternative explanation is that the increase in both serum folate and MMA concentrations resulted from … *E-mail: epq{at}ufl.edu

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