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The Vomeronasal Organ

The vomeronasal organ (VNO) or Jacobson's organ is a chemoreceptor organ present in most tetrapod species. It is important in intraspecific chemical (pheromone) communication. The paired organs are separate from the main olfactory organ. In most species they are largely enclosed within a capsule formed by the vomer-bone or vomer-cartilage and are found within a bulge along each side of the base of the nasal septum.