N4-glycosyl-L-asparagine hexosaminylated residue N4-hexosaminylated asparagine 161.0688018798828125 161.160003662109375 275.111724853515625 275.260009765625 A protein modification that effectively converts an L-asparagine residue to an N4-hexosaminyl-L-asparagine. C 10 H 17 N 3 O 6 C 6 H 11 N 1 O 4 HexN Hexosamine MOD:01303 N PSI-MOD The natural modifications are N4-(N-acetylamino)galactosyl-L-asparagine (MOD:00832) or N4-(N-acetylamino)glucosyl-L-asparagine (MOD:00831) [JSG]. Unimod:454 artifact