1QFR:
reference: Three-dimensional structure of the histidine-containing phosphocarrier protein (HPr) from Enterococcus faecalis in solution., Maurer T, Doker R, Gorler A, Hengstenberg W, Kalbitzer HR, Eur J Biochem 2001 Feb;268(3):635-44. PMID: 11168402

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