Protein complexes that take part in the process of PHOTOSYNTHESIS. They are located within the THYLAKOID MEMBRANES of plant CHLOROPLASTS and a variety of structures in more primitive organisms. There are two major complexes involved in the photosynthetic process called PHOTOSYSTEM I and PHOTOSYSTEM II.

Synonyms: 0, Reaction Center, Photosynthetic, Photosynthetic Reaction Center Complex Protein, Photosynthetic Reaction Center, Reaction Centers, Photosynthetic, Complex, Photosynthetic, Photosynthetic Complex, Photosynthetic Reaction Centers, Photosynthetic Complexes, Photosynthetic Reaction Center Complex Proteins, Center, Photosynthetic Reaction, Complexes, Photosynthetic