... c yanobacterial and plant photosystem II lightharvesting systems.Keywords: photosynthesis, structure, photosystem II, light-harvesting, electron crystallography.Photosynthesis, one o f the ... interconnected by unstackedregions of membrane (see Fig. 1A). In the classical view of plant photosynthesis, one part of the photosyntheticelectron transfer chain (photosystem II) is segregated into the ... whilst other components of the system (photo-system I an d the H+-ATPase) are located in the unstackedthylakoid membranes [1±3]. The location o f t he fourthcomponent of the photosynthetic system,...