Shared synteny of the tucHOG0456 ( ral ) gene region among the haloarchaeal chromosomes. In Halobacterium sp. NRC-1, ral (purple) is transcriptionally linked to rfa3 (blue) and rfa8 (pink), an additional gene, coding for a predicted helicase (turquoise), near the rfa3-rfa8-ral operon in Halobacterium sp. NRC-1 is also highly conserved. Haloarchaeal chromosomes are designated with the following abbreviations: Halobacterium sp. NRC-1 (NRC-1), H. marismortui (Hma), N. pharaonis (Nph), H. walsbyi (Hwa), H. lacusprofundi (Hla), H. borinquense (Hbo), H. mukohataei (Hmu), H. utahensis (Hut), H. volcanii (Hvo), H. turkmenica (Htu), N. magadii (Nma), H. jeotgali (Hje), and H. xanaduensis (Hxa).