Mouse Sex Differences (IMAGE) Washington University School of Medicine Caption A specific kind of neuron found only in male mice and that detects a pheromone in female urine has been identified by researchers at Washington University School of Medicine in St. Louis. But the sex difference is not hard-wired. By manipulating the mice's living conditions and exposing male mice to female scents for long periods of time, the scientists showed that males lost these neurons and, with them, their interest in courting females. Credit Eric Young Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.