Wang et al. (page 1367-1381) report a structure of photosystem I from a higher plant at the highest resolution achieved so far. On the cover: The structure of the PSI-LHCI supercomplex with a view from the stromal side. Novel lipids were found in the gap region and they mediate interactions between the core and antenna. Lhca4 was found to be fl exible, which may moderate energy transfer from LHCIs to PSI core.