S-selenyl-L-cysteine 182.1199951171875 182.9257049560546875 78.970001220703125 79.9165191650390625 C 3 H 5 N 1 O 1 S 1 Se 1 cysteine perselenide A protein modification that effectively converts an L-cysteine residue to S-selenyl-L-cysteine. S-selenylcysteine S-selanylcysteine (R)-2-amino-3-(selanylsulfanyl)propanoic acid C ACT_SITE S-selanylcysteine intermediate hypothetical 2-amino-3-hydroselenosulfidopropanoic acid Se 1 none PSI-MOD MOD_RES S-selenylcysteine Delta:Se(1) S-selanyl-L-cysteine selenyl MOD:00282 2-amino-3-hydroselenylthiopropanoic acid 2-amino-3-hydroselenylsulfidopropanoic acid selenium containing residue modified L-cysteine residue