1CE4:
reference: The complete Consensus V3 loop peptide of the envelope protein gp120 of HIV-1 shows pronounced helical character in solution., Vranken WF, Budesinsky M, Fant F, Boulez K, Borremans FA, FEBS Lett 1995 Oct 23;374(1):117-21. PMID: 7589496

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