UASt regulatory sequences drive expression of Hsap\TAS2R4 tagged with Tag:polyHis.
Flies expressing Hsap\TAS2R4Scer\UAS.T:Zzzz\His6 under the control of Scer\GAL4Gr5a.PU show a small but significant preference for the bitter ligands quinine hydrochloride and denatonium benzoate compared to controls. No difference is seen in the flies' preference for phenylthiocarbamide (PTC).