1ZHI:
reference: Structural basis of the Sir1-origin recognition complex interaction in transcriptional silencing., Hou Z, Bernstein DA, Fox CA, Keck JL, Proc Natl Acad Sci U S A. 2005 Jun 14;102(24):8489-94. Epub 2005 Jun 2. PMID: 15932939

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