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The remaining function of the light-dependent reaction is to generate the other energy-carrier molecule, NADPH. As the electron from the electron transport chain arrives at photosystem I, it is
re-energized with another photon captured by chlorophyll. The energy from this electron drives the formation of NADPH from 
and a hydrogen ion (
). Now that the solar energy is stored in energy carriers, it can be used to make a sugar molecule.
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