4UPC:
reference: Three-dimensional structure of human gamma-secretase., Lu P, Bai XC, Ma D, Xie T, Yan C, Sun L, Yang G, Zhao Y, Zhou R, Scheres SH, Shi Y, Nature. 2014 Jun 29. doi: 10.1038/nature13567. PMID: 25043039

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