1YS7:
reference: The structural basis of signal transduction for the response regulator PrrA from Mycobacterium tuberculosis., Nowak E, Panjikar S, Konarev P, Svergun DI, Tucker PA, J Biol Chem. 2006 Apr 7;281(14):9659-66. Epub 2006 Jan 23. PMID: 16434396

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