1Y7M:
reference: B. subtilis ykuD protein at 2.0 A resolution: insights into the structure and function of a novel, ubiquitous family of bacterial enzymes., Bielnicki J, Devedjiev Y, Derewenda U, Dauter Z, Joachimiak A, Derewenda ZS, Proteins. 2006 Jan 1;62(1):144-51. PMID: 16287140

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