PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 24971648-7 2014 We report four disulfide linkages in HBx protein, viz., between Cys(7) and Cys(69), Cys(61) and Cys(115), Cys(78) and Cys(137), and Cys(17) and Cys(143), based on the differential mobility of corresponding disulfide-linked peptide ions under reducing and nonreducing conditions. Peptides 223-230 X protein Hepatitis B virus 37-40