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EPR properties of Cyt b-559 have been investigated in intact chloroplasts that are functionally competent in O 2 evolution and in CO 2 fixation. After chemical oxidation of Cyt b-559 by 10 mM 2,3-dicyano, 4, 5-dichloro-p-benzoquinone (DDQ) the major part of Cyt b-559 is found to be present in the high spin Fe(III) form. Only a small fraction of low spin heme Fe(III) (less than 5%)...
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