PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 7642961-5 1995 Examination of the amino acid sequences of proinsulin and proglucagon has shown that both molecules display this Arg-Arg dipeptide sequence, which could explain the labeling obtained on both cell types. Dipeptides 121-130 insulin Homo sapiens 43-53