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Meta-analysis of three GWA scans for plasma one-carbon metabolites. Manhattan plot of genome-significant associations (defined as P = 5 × 10−8 and depicted by the grey dashed line) for plasma homocysteine (A), plasma vitamin B12 (C) and plasma PLP (D) in a meta-analysis of participants from NHS CGEMS, Framingham SHARe Women and Framingham SHARe Men.
