“…Various photosynthetic RCs of plants (Alia et al, 2004;Diller et al, 2005Diller et al, , 2007Janssen et al, 2018), algae (Janssen et al, 2010(Janssen et al, , 2012, diatoms (Zill et al, 2017(Zill et al, , 2019, purple bacteria (Prakash et al, 2007;Daviso et al, 2009b;Paul et al, 2019), heliobacteria (Thamarath et al, 2012b), green sulfur bacteria (Roy et al, 2008), and flavoproteins (Thamarath et al, 2010;Ding et al, 2019) have been analyzed with the photo-CIDNP MAS NMR method. Previously, the application of 13 C photo-CIDNP MAS NMR was restricted to the unlabeled and isolated PSI complex due to difficulties in obtaining selective 13 C labeling in plants.…”