PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8648633-9 1996 The structure reveals that the lost ability of des-[Phe(B25)] insulin to self-associate is caused by a conformational change of the C-terminal region of the B-chain, which results in an intra-molecular hydrophobic interaction between Pro(B28) and the hydrophobic region Leu(B11)-Leu(B15) of the B-chain alpha-helix. Proline 234-237 insulin Homo sapiens 62-69