4S0K:
reference: Transition states. Trapping a transition state in a computationally designed protein bottle., Pearson AD, Mills JH, Song Y, Nasertorabi F, Han GW, Baker D, Stevens RC, Schultz PG, Science. 2015 Feb 20;347(6224):863-7. doi: 10.1126/science.aaa2424. PMID: 25700516

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