Photosystem
（重定向自Photosystem ii protein complex）
![Light-dependent reactions of photosynthesis at the thylakoid membrane](/Images/godic/202502/02/Thylakoid_membrane_3.svg4508.png")
Photosystems are functional and structural units of protein complexes involved in photosynthesis that together carry out the primary photochemistry of photosynthesis: the absorption of light and the transfer of energy and electrons. Photosystems are found in the thylakoid membranes of plants, algae and cyanobacteria (in plants and algae these are located in the chloroplasts), or in the cytoplasmic membrane of photosynthetic bacteria. There are two kinds of photosystems: II and I, respectively.