Inside a Mouse's Ear (IMAGE) Washington University in St. Louis Caption The arteries (red) and veins (green) stand out clearly in a photoacoustic microscope image of a mouse ear. The new imaging technique, which marries sound and light to garner optical quality images of tissues beneath the skin is very sensitive to color changes like those that occur as hemoglobin becomes saturated with oxygen. Credit Song Hu/Lihong Wang Usage Restrictions Credit required 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.