3BSG:
reference: Multi-site substrate binding and interplay in barley alpha-amylase 1., Nielsen MM, Seo ES, Bozonnet S, Aghajari N, Robert X, Haser R, Svensson B, FEBS Lett. 2008 Jul 23;582(17):2567-71. Epub 2008 Jun 25. PMID: 18588886

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