1BTD:
reference: Betadoublet: de novo design, synthesis, and characterization of a beta-sandwich protein., Quinn TP, Tweedy NB, Williams RW, Richardson JS, Richardson DC, Proc Natl Acad Sci U S A 1994 Sep 13;91(19):8747-51. PMID: 8090717

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