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Comparative levels of the 23-kDa D1 protein fragment in thylakoids not EDTA-washed before photoinactivation and subsequently incubated in darkness for 90 min in the absence (−) or presence (+) of 0.5 mM ATP, 0.5 mM zinc acetate, 2 mM EDTA, and 0.5 mM ATP[γS].
