derives from N6,N6-dimethyl-L-lysine modified L-lysine residue 2x(13)C,4x(2)H labeled dimethylated residue 2x(13)C,4x(2)H labeled dimethylated L-lysine 162.1580810546875 162.1699981689453125 34.060001373291015625 34.06311798095703125 H 12 (2)H 4 (12)C 6 (13)C 2 N 2 O 1 MOD:01357 DiMethyl-C13HD2 (2)H 4 (13)C 2 K none PSI-MOD Dimethyl:2H(4)13C(2) artifact A protein modification that effectively replaces two hydrogen atoms of an L-lysine residue containing common isotopes with two (13)C,3x(2)H labeled methyl groups to form a 2x(13)C,6x(2)H labeled dimethylated L-lysine.