PKD2L1 (Polycystic Kidney Disease 2-Like 1): PKD2L1 is a transmembrane protein from the polycystic kidney disease family, predominantly found in sensory neurons of the peripheral nervous system and specific epithelial cells. It plays a crucial role in chemosensation and mechanosensation, particularly in detecting sour taste. Functioning as a non-selective cation channel, PKD2L1 facilitates ion influx in response to extracellular stimuli, initiating cellular responses. It is also involved in functions such as gastrointestinal sensory signaling and regulation of blood pressure.