5O1X:
reference: The structure of transcription termination factor Nrd1 reveals an original mode for GUAA recognition., Franco-Echevarria E, Gonzalez-Polo N, Zorrilla S, Martinez-Lumbreras S, Santiveri CM, Campos-Olivas R, Sanchez M, Calvo O, Gonzalez B, Perez-Canadillas JM, Nucleic Acids Res. 2017 Sep 29;45(17):10293-10305. doi: 10.1093/nar/gkx685. PMID: 28973465

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