Question: what are olfactory receptors found in humans?
Answer: The initial event in odor perception is the detection of odorants by olfactory (odorant) receptors (ORs), which are located on olfactory sensory neurons in the olfactory epithelium of the nose (1–4). ORs are seven-transmembrane domain G protein-coupled receptors, which are encoded by a large multigene family (1, 5).