1PVP:
reference: A specificity switch in selected cre recombinase variants is mediated by macromolecular plasticity and water., Baldwin EP, Martin SS, Abel J, Gelato KA, Kim H, Schultz PG, Santoro SW, Chem Biol 2003 Nov;10(11):1085-94. PMID: 14652076

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