| 1PPT: reference: X-ray analysis (1. 4-A resolution) of avian pancreatic polypeptide: Small globular protein hormone., Blundell TL, Pitts JE, Tickle IJ, Wood SP, Wu CW, Proc Natl Acad Sci U S A. 1981 Jul;78(7):4175-4179. PMID: 16593056 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).