1BQT:
reference: Three-dimensional structure of human insulin-like growth factor-I (IGF-I) determined by 1H-NMR and distance geometry., Sato A, Nishimura S, Ohkubo T, Kyogoku Y, Koyama S, Kobayashi M, Yasuda T, Kobayashi Y, Int J Pept Protein Res 1993 May;41(5):433-40. PMID: 8391516

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).