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The reaction center chlorophyll (or the primary electron donor) of photosystem I that is most reactive and best in absorbing light at wavelength of 700 nm.


P700 consists of a group of pigments acting as a single entity or like a single molecule when it receives excitation energy. It is named after the wavelength (in nanometers) of their red-peak absorption maximum, which in this case, is the deep-red or 700 nm.

Compare: P680
See also: photosystem I

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