2LP4:
reference: Solution structure of a complex of the histidine autokinase CheA with its substrate CheY., Mo G, Zhou H, Kawamura T, Dahlquist FW, Biochemistry. 2012 May 8;51(18):3786-98. Epub 2012 Apr 26. PMID: 22494339

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