6CMN:
reference: Structure of HIV TAR in complex with a Lab-Evolved RRM provides insight into duplex RNA recognition and synthesis of a constrained peptide that impairs transcription., Belashov IA, Crawford DW, Cavender CE, Dai P, Beardslee PC, Mathews DH, Pentelute BL, McNaughton BR, Wedekind JE, Nucleic Acids Res. 2018 Jun 29. pii: 5046099. doi: 10.1093/nar/gky529. PMID: 29961805

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