PKD2L1 (Polycystic Kidney Disease 2-Like 1): PKD2L1 is a transmembrane protein of the polycystic kidney disease family, mainly found in sensory neurons of the peripheral nervous system and certain epithelial cells. It plays an essential role in chemosensation and mechanosensation, especially in detecting sour taste. Acting as a non-selective cation channel, PKD2L1 enables ion influx in response to extracellular stimuli, triggering cellular responses. It is also involved in processes such as gastrointestinal sensory signaling and blood pressure regulation.