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By Aileen Constans

PS II unveiled

The photosynthetic enzyme Photosystem II (PSII) generates all of Earth?s atmospheric oxygen through a thermodynamically unfavorable reaction, splitting water into hydrogen and oxygen using solar energy. ?It?s been the Holy Grail of photosynthesis research ? to obtain structural information about the catalytic center where this very remarkable reaction occurs,? says biochemist James Barber of Imperial College London.



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