1KNX:
reference: Crystal structure of HPr kinase/phosphatase from Mycoplasma pneumoniae., Allen GS, Steinhauer K, Hillen W, Stulke J, Brennan RG, J Mol Biol 2003 Feb 28;326(4):1203-17. PMID: 12589763

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