1GWP:
reference: Structure of the N-terminal 283-residue fragment of the immature HIV-1 Gag polyprotein., Tang C, Ndassa Y, Summers MF, Nat Struct Biol. 2002 Jul;9(7):537-43. PMID: 12032547

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