Scientists performed X-ray footprinting mass spectrometry experiments at the ALS to better understand the orange carotenoid protein (OCP) and its interaction with the fluorescent recovery protein in cyanobacteria photoprotection. This research could help improve photosynthetic efficiency. https://biosciences.lbl.gov/2019/06/12/x-ray-footprinting-reveals-molecular-basis-of-orange-carotenoid-protein-photoprotection/