6HVL:
reference: Crystal structures of the c-di-AMP synthesizing enzyme CdaA., Heidemann JL, Neumann P, Dickmanns A, Ficner R, J Biol Chem. 2019 May 22. pii: RA119.009246. doi: 10.1074/jbc.RA119.009246. PMID: 31118276

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