I moved to Harvard Medical School. I became an assistant professor there in neurobiology, and my next goal was to determine how the signals from these receptors in the nose were translated by the brain into perceptions. So there are actually about 350 different odorant receptors in humans, and about 1,000 different ones in mice. Mice we use as a model organism to understand how these systems work. So over the next ten years at Harvard, we used genes in coding the odorant receptors to try to understand how information is encoded in the system, and to give different perceptions. I was very fortunate to have a series of wonderful students and postdoctoral scientists that worked with me over that period, and it was a tremendous amount of fun just trying to figure out how it worked. We found out how information from the 1,000 different receptors is organized, first in the nose, and then in the two major relay centers in the brain: the olfactory bulb, which is in the front of the brain, and then the olfactory cortex.