1.A.69.3.3
Gustatory receptor 28b isoform D of 470 aas and 8 TMSs. It mediates acceptance or avoidance behavior, depending on its substrates. Its atypical expression suggests additional nongustatory roles in the nervous system and tissues involved in proprioception (warmth receptor), hygroreception, and other sensory modalities. It is also possible that it has chemosensory roles in the detection of internal ligands (Thorne and Amrein 2008). Saponins function in natural self-defense for plants to deter various insects due to their unpleasant taste and toxicity. Sang et al. 2019 provided evidence that saponin from Quillaja saponaria functions as an antifeedant as well as an insecticide to ward off insects in both the larval and the adult stages.