Porphyrin (IMAGE) Arizona State University Caption Gary Moore and his colleagues describe the use of ring-shaped molecules known as porphyrins, seen in this graphic. Such molecules, among the most abundant pigments in nature, are noted for their ability to speed up or catalyze chemical reactions, including important reactions occurring in living systems. They are useful components for the design of artificial photosynthetic systems. Credit Cover graphic by Jason Drees, Multimedia Developer Lead at ASU Usage Restrictions None License Original 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.