6GG4:
reference: An allostatic mechanism for M2 pyruvate kinase as an amino-acid sensor., Yuan M, McNae IW, Chen Y, Blackburn EA, Wear MA, Michels PAM, Fothergill-Gilmore LA, Hupp T, Walkinshaw MD, Biochem J. 2018 May 10. pii: BCJ20180171. doi: 10.1042/BCJ20180171. PMID: 29748232

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