half cystine -1.007825016975402832 -1.0099999904632568359 102.0013580322265625 102.12999725341796875 A protein modification that can be regarded as effectively either one half of a cystine cross-link, or a cysteine residue with one hydrogen atom or proton removed. C C 0 H -1 N 0 O 0 S 0 C 3 H 4 N 1 O 1 S 1 Dehydro Half of a disulfide bridge MOD:00798 PSI-MOD Unimod:374 modified L-cysteine residue