PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 21921028-10 2011 These results suggest that CPO cleaves acidic amino acids from dietary proteins and peptides, thus complementing the actions of well known digestive carboxypeptidases CPA and CPB. cpb 175-178 carboxypeptidase O Homo sapiens 27-30