6VCI:
reference: LetB Structure Reveals a Tunnel for Lipid Transport across the Bacterial Envelope., Isom GL, Coudray N, MacRae MR, McManus CT, Ekiert DC, Bhabha G, Cell. 2020 Apr 30;181(3):653-664.e19. doi: 10.1016/j.cell.2020.03.030. PMID: 32359438

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