transcription, транскрипция: [ ˈfō-tō-ˌsis-təm ]
noun
Date: 1964
: 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