6DBA:
reference: Structural Basis of VHH mediated neutralization of the foodborne pathogen Listeria monocytogenes., Toride King M, Huh I, Shenai A, Brooks TM, Brooks CL, J Biol Chem. 2018 Jul 5. pii: RA118.003888. doi: 10.1074/jbc.RA118.003888. PMID: 29976754

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