6QAM:
reference: A beta-barrel for oil transport through lipid membranes: Dynamic NMR structures of AlkL., Schubeis T, Le Marchand T, Daday C, Kopec W, Tekwani Movellan K, Stanek J, Schwarzer TS, Castiglione K, de Groot BL, Pintacuda G, Andreas LB, Proc Natl Acad Sci U S A. 2020 Aug 19. pii: 2002598117. doi:, 10.1073/pnas.2002598117. PMID: 32817429

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