S-(2-aminoethyl)cysteine (Ser) 146.0513916015625 146.2100067138671875 59.01935577392578125 59.1399993896484375 MOD:00882 From DeltaMass: Average Mass: 146 Abbreviation:-AECys_ Formula:C5H10O2N1S1 Monoisotopic Mass Change:146.051 Average Mass Change:146.214 References:PE Sciex. S AEC-MAEC none Aminoethyl Cysteinyl (AECys) artifact C 5 H 10 N 2 O 1 S 1 A protein modification that effectively converts an L-serine residue to S-(2-aminoethyl)cysteine. aminoethylcysteine C 2 H 5 N 1 O -1 S 1 PSI-MOD modified L-serine residue