– OMP (Olfactory Marker Protein) is a Protein Coding gene. OMP is a protein expressed in the mature olfactory and vomeronasal neurons of many vertebrates, such as mammals, amphibians, and bony fishes. Its structure and protein sequence are highly conserved between the mouse, rat, and human. OMP is a ubiquitous, cytoplasmic protein found in mature olfactory receptor neurons of all vertebrates. It participates in the olfactory signal transduction pathway. OMP expression is a hallmark of mature vertebrate olfactory receptor neurons (ORNs). Evidence for OMP function derives from altered behavioral and electrophysiological activities of OMP-KO mice. Diseases associated with OMP include Epiglottitis and Haemophilus Influenzae.