Vmn1r191 (vomeronasal 1 receptor 191; also called V1Rh15) is a member of the vomeronasal organ V1R gene family, whose activation is believed to be involved with pheromone detection. Inputs from neurons expressing closely related V1Rs intermingle within shared, spatially conserved domains of the accessory olfactory bulb (AOB). Vomernasal sensory neurons expressing Vmn1r191 are labeled with tau-CFP in this mutant strain.