6LN3:
reference: Crystal structure of adenylate kinase from an extremophilic archaeon Aeropyrum pernix with ATP and AMP., Shibanuma Y, Nemoto N, Yamamoto N, Sampei GI, Kawai G, J Biochem. 2020 Apr 9. pii: 5818497. doi: 10.1093/jb/mvaa043. PMID: 32271910

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