than men. [ 11 ] (Methylthio)methanethiol (MeSCH 2 SH; MTMT) is a strong-smelling volatile thiol, also detectable at parts per billion levels, found in male mouse urine. Lawrence C. Katz and coworkers showed that MTMT functioned as a semiochemical , activating certain mouse olfactory sensory neurons, attracting female mice. [ 12