4XD7:
reference: Structure of a thermophilic F1 -ATPase inhibited by an epsilon-subunit: deeper insight into the epsilon-inhibition mechanism., Shirakihara Y, Shiratori A, Tanikawa H, Nakasako M, Yoshida M, Suzuki T, FEBS J. 2015 Aug;282(15):2895-913. doi: 10.1111/febs.13329. Epub 2015 Jun 19. PMID: 26032434

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