MUP1 is a subfamily of proteins appears highly in the urine and other secretions of various animals. MUP1 provides a minor range of identifying information regarding the donor animal， once detected by the vomeronasal organ of the receiving animal. MUP1 can as well act as protein pheromones themselves. MUP1has been shown to encourage aggression in male mice， and 1 specific Mup protein found in male mouse urine is sexually attractive to female mice.
