Showing Skin (IMAGE) Rockefeller University Caption In the outer layer of the skin, microRNA-203 helps build a tough protective barrier by repressing the activity of a molecule called p63 (red). When microRNA-203 can't stem p63's activity, cells proliferate (bottom) -- findings that may reveal new insights about cancer. Credit The Rockefeller University 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.