O-glycosyl-L-serine O-(N-acetylamino)fucosyl-L-serine (2S)-2-amino-3-(2-acetamido-2-deoxy-beta-D-fucopyranosyloxy)propanoic acid 187.0844573974609375 187.19000244140625 274.116485595703125 274.269989013671875 A protein modification that effectively converts an L-serine residue to O3-(N-acetamino)fucosylserine. C 11 H 18 N 2 O 6 C 8 H 13 N 1 O 4 CARBOHYD O-linked (FucNAc) serine MOD:00834 O-(2-acetylamino-2-deoxy-beta-D-fucopyranosyl)-L-serine O-(N-acetylamino)fucosyl-L-serine O-(N-acetylfucosaminyl)serine O-seryl-beta-N-acetylfucosaminide O3-(2-acetamido-2-deoxy-beta-D-fucopyranosyl)-L-serine O3-(N-acetylfucosaminyl)serine OFucNAcSer PSI-MOD S natural uniprot.ptm:PTM-0553