1PSP:
reference: Pancreatic spasmolytic polypeptide: first three-dimensional structure of a member of the mammalian trefoil family of peptides., Gajhede M, Petersen TN, Henriksen A, Petersen JF, Dauter Z, Wilson KS, Thim L, Structure 1993 Dec 15;1(4):253-62. PMID: 8081739

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