Why We Smell Better When We Sniff (IMAGE) University of Pennsylvania School of Medicine Caption Cross section of olfactory sensory neurons in a mouse nose visualized by fluorescent staining of odorant receptor genes (red and green represent different odorant receptors). MOE: main olfactory epithelium; SO: septal organ. Credit Huikai Tian, PhD, Minghong Ma, PhD, University of Pennsylvania School of Medicine 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.