deuterium tetrasubstituted residue modified L-lysine residue (4,4,5,5-(2)H4)-L-lysine (1)H -4 (2)H 4 132.1199951171875 132.1200714111328125 4,4,5,5-D4 Lysine 4,4,5,5-tetradeuterolysine 4.0251069068908691406 4.0300002098083496094 A protein modification that effectively substitutes four (1)H protium atoms with four (2)H deuterium atoms to produce (4,4,5,5-(2)H4)-L-lysine. C 6 (1)H 8 (2)H 4 N 2 O 1 For SILAC experiments. K Label:2H(4) MOD:00942 PSI-MOD Unimod:481 artifact lys-2H4