Parle-McDermott A, McManus EJ, Mills JL, O'Leary VB, Pangilinan F, Cox C, Weiler A, Molloy AM, Conley M, Watson D, Scott JM, Brody LC, Kirke PN; Birth Defects Research Group. Polymorphisms within the vitamin B12 dependent methylmalonyl-coA mutase are not risk factors for neural tube defects. Mol Genet Metab.