P3H4O1T1O1S1Y4S1T1E1M3S1
22 points
PHOTOSYSTEMS is validvalid
PHOTOSYSTEM, [n]
PHOTOSYSTEM, either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts [n]
PHOTOSYSTEM, [n]
PHOTOSYSTEM, either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts [n]