PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 3074629-6 1988 The MTX-ala and, to a lesser extent, MTX-arg were substrates for pancreatic carboxypeptidase B. methotrexate-alpha-alanine 4-11 carboxypeptidase B1 (tissue) Mus musculus 76-94