From -606 to +978 with respect to the Ir21a translational start site ( 2L:24173..25757 , reverse complement) fused upstream of a GAL4 driver.
ScerGAL4Ir21a.PK drives expression in the dorsal organ cool cells, ~100 cells in the brain and ventral nerve cord and sensory neurons in the tail.
ScerGAL4Ir21a.PK drives expression in Ir93a positive dorsal organ cool cells.