5J0L:
reference: De novo design of protein homo-oligomers with modular hydrogen-bond network-mediated specificity., Boyken SE, Chen Z, Groves B, Langan RA, Oberdorfer G, Ford A, Gilmore JM, Xu C, DiMaio F, Pereira JH, Sankaran B, Seelig G, Zwart PH, Baker D, Science. 2016 May 6;352(6286):680-7. doi: 10.1126/science.aad8865. PMID: 27151862

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