. "Genetically modified source" . "pET21a" . "Sulfolobus" . "Escherichia" . . "Sulfolobus tokodaii" . . "Escherichia coli BL21(DE3)" . "BL21(DE3)" . "plasmid" . "Sulfolobus tokodaii" . "ST1022" . "7" . "Escherichia coli" .