4EFA:
reference: Crystal Structure of the Yeast Vacuolar ATPase Heterotrimeric EGC(head) Peripheral Stalk Complex., Oot RA, Huang LS, Berry EA, Wilkens S, Structure. 2012 Sep 18. pii: S0969-2126(12)00321-8. doi:, 10.1016/j.str.2012.08.020. PMID: 23000382

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