Different states of Photosystem I (IMAGE) Science For Life Laboratory Caption While monomer and trimer have been known before, the mini-PSI, dimer, and specialised dimer of dimers, which are reported in the current work, expand on our understanding of the diversity of photosynthetic mechanisms in nature. Credit Ella Marushchenko 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.