1A1T:
reference: Structure of the HIV-1 nucleocapsid protein bound to the SL3 psi-RNA recognition element., De Guzman RN, Wu ZR, Stalling CC, Pappalardo L, Borer PN, Summers MF, Science 1998 Jan 16;279(5349):384-8. PMID: 9430589

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