MTHFR and hyperhomocysteinemia: (( "Hyperhomocysteinemia/classification"[Mesh] OR "Hyperhomocysteinemia/complications"[Mesh] OR "Hyperhomocysteinemia/genetics"[Mesh] )) AND ("Methylenetetrahydrofolate Reductase (NADPH2)"[Mesh] AND ( "Methylenetetrahydrofolate Reductase (NADPH2)/biosynthesis"[Mesh] OR "Methylenetetrahydrofolate Reductase (NADPH2)/deficiency"[Mesh] OR "Methylenetetrahydrofolate Reductase (NADPH2)/genetics"[Mesh] ))