PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2563380-11 1989 This conclusion is supported also by direct amino acid analysis of acid hydrolysates which shows that the oxidation of glutamine synthetase, enolase, and phosphoglycerate kinase is associated with the loss of at least 1 histidine residue per subunit. Histidine 220-229 Enolase Escherichia coli 141-148