21. Mice detect pheromones mainly with the vomeronasal organ ( Jacobson's organ ), located at the bottom of the nose. 22. This suggests that the vomeronasal organ plays an active role in maternal identification of the lamb at the udder 23. The vomeronasal organ and the main olfactory epithelium, together called the olfactory system, detect pheromones from the opposite sex. 24. Like all monitors, the Argus has a forked tongue and a vomeronasal organ in the roof of its mouth. 25. One group was allowed to sniff synthesized pheromones that are said to act on the vomeronasal organ in the nose. 26. In the mouse's vomeronasal organ , there are 100 genes serving one family of receptors and 140 genes in the other. 27. Three distinct families of putative pheromone receptors have been identified in the vomeronasal organ ( V1Rs, V2Rs and V3Rs ). 28. The vomeronasal organ is mainly used to detect pheromones, chemical messengers that carry information between individuals of the same species. 29. Except the hartebeest and the topi, all bovids can detect estrus in females by testing the urine using the vomeronasal organ . 30. Chemical communication does appear to occur among humans, but this does not necessarily imply that the human vomeronasal organ is functional.
