PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3026342-14 1986 Reaction of diethyl pyrocarbonate-treated alpha 2M with hydroxylamine reversed derivatization of 43 of the 53 histidine residues. Hydroxylamine 56-69 alpha-2-macroglobulin Homo sapiens 42-50