2MZX:
reference: An extended CCR5 ECL2 peptide forms a helix that binds HIV-1 gp120 through non-specific hydrophobic interactions., Abayev M, Moseri A, Tchaicheeyan O, Kessler N, Arshava B, Naider F, Scherf T, Anglister J, FEBS J. 2015 Feb 20. doi: 10.1111/febs.13243. PMID: 25703038

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