HomocysteineHyperhomocysteinemiaVitamin B 12Folic AcidVitamin B ComplexMethylenetetrahydrofolate Reductase (NADPH2)Methylmalonic AcidVitamin B 6Oxidoreductases Acting on CH-NH Group DonorsVitamin B 12 DeficiencyPyridoxineMethylenetetrahydrofolate Dehydrogenase (NAD+)Folic Acid DeficiencyHomocystineMethionineFluorescence Polarization ImmunoassayRiboflavin