Researchers at the University of Maryland School of Medicine have found a “nose within the nose,” a unique olfactory system within the noses of mice that is able to “smell” hormones involved in regulating water and salt balance in the body. This research may lead to new insights into the complex system of “chemical communication” between individuals. The findings are published in the Proceedings of the National Academy of Sciences online early edition the week of August 27-31, 2007.