6S3B:
reference: The structural basis for signal promiscuity in a bacterial chemoreceptor., Gavira JA, Matilla MA, Fernandez M, Krell T, FEBS J. 2020 Oct 5. doi: 10.1111/febs.15580. PMID: 33021055

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