5YLV:
reference: Crystal structures of the gastric proton pump., Abe K, Irie K, Nakanishi H, Suzuki H, Fujiyoshi Y, Nature. 2018 Apr;556(7700):214-218. doi: 10.1038/s41586-018-0003-8. Epub 2018 Apr, 4. PMID: 29618813

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