Thermostability of cPGIs from A. fulgidus, M. mazei, S. enterica serovar Typhimurium, and E. meliloti. (A) AfcPGI; (B) MmcPGI; (C) StcPGI; (D) EmcPGIA. Symbols indicate thermostability at 100°C (▾), 95°C (⧫), 90°C (▴), 80°C (•), 70°C (▪), 60°C (▿), 55°C (▵), 50°C (○), and 40°C (□).