1OLA:
reference: The structural basis of sequence-independent peptide binding by OppA protein., Tame JR, Murshudov GN, Dodson EJ, Neil TK, Dodson GG, Higgins CF, Wilkinson AJ, Science 1994 Jun 10;264(5165):1578-81. PMID: 8202710

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