(A) Sequence alignments of promoter regions of four genes up-regulated by UV-B in Halobacterium sp. NRC-1, showing that they share an 11-base pair sequence motif upstream of the promoter. (B) Sequence alignments of promoter regions of radA genes of other archaea containing an identical or similar 11-base-pair motif. The 11-base pair motif and putative TATA-boxes are highlighted by shading. Hma, Haloarcula marismortui; Hla, Halorubrum lacusprofundi; Hwa, Haloquadratum walsbyi; Nph, Natronobacterium pharaonis; Mhu, Methanospirillum hungatei.