wherein Asn and His represent an asparagine residue and a histidine residue, respectively, and X represents a hydrogen atom or a sugar chain, and {HEAD ~ A} and B each represent independently {TAIL ~ a hydrogen atom} or an amino acid residue 
wherein Asn and His represent an asparagine residue and a histidine residue , respectively , and X represents a hydrogen atom or a sugar chain , and { HEAD ~ A } and B each represent independently { TAIL ~ a hydrogen atom } or an amino acid residue
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH