1FNT:
reference: Structural basis for the activation of 20S proteasomes by 11S regulators., Whitby FG, Masters EI, Kramer L, Knowlton JR, Yao Y, Wang CC, Hill CP, Nature 2000 Nov 2;408(6808):115-20. PMID: 11081519

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