TTV1, TTV2 and TTV3, a family of viruses of the extremely thermophilic, anaerobic, sulfur reducing archaebacterium Thermoproteus tenax

Three different temperent viruses of the extremely thermophilic chemolithoautotrophic archaebacterium, Thermoproteus tenax, TTV1, TTV2 and TTV3, each contain linear, double-stranded DNA, TTV1 and TTV2 of 16 kb, TTV3 of 27 kb. They are oblong and each consists of an outer envelope and an inner core associated with the DNA.