Olfactory receptor for medium length odd-chained diamines including cadaverine which is generated by bacterial decarboxylation of the basic amino acid lysine and contributes to the odor of decomposing tissue. Mediates pronounced innate aversion behavior to cadaverine. Expressed in olfactory epithelium (at protein level). Detected in a sparse population of olfactory sensory neurons. Belongs to the G-protein coupled receptor 1 family.