photosystem
noun
pho·to·sys·tem
ˈfō-tō-ˌsi-stəm
: either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts:
a
: one that absorbs light with a wavelength of about 700 nanometers
called also photosystem I
b
: one that absorbs light with a wavelength of about 680 nanometers
called also photosystem II
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Merriam-Webster unabridged
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