The present invention relates to agonists of the human bitter-taste receptors hTAS2R14, hTAS2R10 and hTAS2R4 and their role in bitter taste transduction. The invention also relates to methods for identifying molecules that modulate, e.g. suppress, or enhance hTAS2R14, hTAS2R10 and hTAS2R4 bitter taste transduction or bitter taste response.