Maximum likelihood phylogenetic tree of FGGY-family kinases in the Thermotogales. The numbers represent bootstrap values (in percent) obtained from 1,000 replicates. TRQ2, Thermotoga sp. strain RQ-2; Tpet, Thermotoga petrophila RKU-1; Tnap, Thermotoga naphthophila RKU-10; CTN, Thermotoga neapolitana DSM 4359; Tlet, Thermotoga lettingae TMO; Theth, Thermotoga thermarum DSM 5069; Tmel, Thermosipho melanesiensis BI429; Fnod, Fervidobacterium nodosum Rt17-B1; Pmob, Petrotoga mobilis SJ95.