2HTJ:
reference: Solution structure of Escherichia coli PapI, a key regulator of the pap pili phase variation., Kawamura T, Le LU, Zhou H, Dahlquist FW, J Mol Biol. 2007 Jan 26;365(4):1130-42. Epub 2006 Oct 25. PMID: 17109885

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