General arrangement of promoter regions of S. singularior and O. pardalina. The locations of HSEs are indicated by filled horizontal rectangles. TATA-boxes are indicated by triangles (T). The shaded rectangles indicate the positions of non-canonical HSEs. Vertical rectangles indicate the positions of GAGA sites (G). The black bended arrows mark the transcription start and direction. D. melanogaster hsp70 promoter (from 70A region) is given at the bottom for comparison. Asterisks above the O. pardalina regulatory region mark single nucleotide polymorphisms.