name: photosynthesis, light reaction
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def: "The light reactions of photosynthesis, which take place in photosystems II and I. Light energy is harvested and used to power the transfer of electrons among a series of electron donors and acceptors. The final electron acceptor is NADP+, which is reduced to NADPH. NADPH generated from light reactions is used in sugar synthesis in dark reactions. Light reactions also generate a proton motive force across the thylakoid membrane, and the proton gradient is used to synthesize ATP. There are two chemical reactions involved in the light reactions: water oxidation in photosystem II, and NADP reduction in photosystem I." 
synonym: "photolysis" RELATED 
is_a: GO:0006091 ! generation of precursor metabolites and energy
relationship: part_of: GO:0015979 ! photosynthesis
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