6GPC:
reference: Domain communication in Thermotoga maritima Arginine Binding Protein unraveled through protein dissection., Smaldone G, Balasco N, Vigorita M, Ruggiero A, Cozzolino S, Berisio R, Del Vecchio P, Graziano G, Vitagliano L, Int J Biol Macromol. 2018 Jul 29;119:758-769. doi:, 10.1016/j.ijbiomac.2018.07.172. PMID: 30059738

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