5L1Z:
reference: Insights into HIV-1 proviral transcription from integrative structure and dynamics of the Tat:AFF4:P-TEFb:TAR complex., Schulze-Gahmen U, Echeverria I, Stjepanovic G, Bai Y, Lu H, Schneidman-Duhovny D, Doudna JA, Zhou Q, Sali A, Hurley JH, Elife. 2016 Oct 12;5. pii: e15910. doi: 10.7554/eLife.15910. PMID: 27731797

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