4I5S:
reference: Mechanistic insights revealed by the crystal structure of a histidine kinase with signal transducer and sensor domains., Wang C, Sang J, Wang J, Su M, Downey JS, Wu Q, Wang S, Cai Y, Xu X, Wu J, Senadheera DB, Cvitkovitch DG, Chen L, Goodman SD, Han A, PLoS Biol. 2013 Feb;11(2):e1001493. doi: 10.1371/journal.pbio.1001493. Epub 2013 , Feb 26. PMID: 23468592

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