1PYI:
reference: Crystal structure of a PPR1-DNA complex: DNA recognition by proteins containing a Zn2Cys6 binuclear cluster., Marmorstein R, Harrison SC, Genes Dev 1994 Oct 15;8(20):2504-12. PMID: 7958913

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