4H54:
reference: Structure and Signaling Mechanism of a Zinc-Sensory Diguanylate Cyclase., Zahringer F, Lacanna E, Jenal U, Schirmer T, Boehm A, Structure. 2013 Jun 11. pii: S0969-2126(13)00156-1. doi:, 10.1016/j.str.2013.04.026. PMID: 23769666

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