1BU2:
reference: Crystal structure of a viral cyclin, a positive regulator of cyclin-dependent kinase 6., Schulze-Gahmen U, Jung JU, Kim SH, Structure Fold Des 1999 Mar 15;7(3):245-54. PMID: 10368294

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