At the Center of Attention (IMAGE) Arizona State University Caption A comparison of the cofactors of a Zn-containing reaction center with those of Photosystem I and Photosystem II from plants. Although the Zn-RC contains 6 identical chlorins, similar to that of Photosystem I, it's function is almost identical to the magnesium containing reaction center (the Photosystem II type of RC). Credit Dr. Su Lin, Arizona State University Biodesign Institute 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.