Common Denominator of Multiple Ailments (IMAGE) University of California - San Diego Caption These fluorescent microscopic images of tissue taken from spontaneously hypertensive rats reveal activity of proteases MMP-1 and MMP-9 as bright spots. The lower image shows tissue from an SHR animal that had been made healthy by treatment with doxycycline, a protease inhibitor. Credit UC San Diego Jacobs School of Engineering Usage Restrictions Credit: UC San Diego Jacobs School of Engineering 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.