1YAC:
reference: The 1.8 A crystal structure of the ycaC gene product from Escherichia coli reveals an octameric hydrolase of unknown specificity., Colovos C, Cascio D, Yeates TO, Structure 1998 Oct 15;6(10):1329-37. PMID: 9782055

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