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Cytochrome P-450 reductase (encoded by the NCP1 gene) was found to catalyse all the NADPH-dependent ferrireductase activities associated with isolated plasma membranes of the yeast Saccharomyces cerevisiae. We therefore examined the contribution of this enzyme to the ferrireductase activity of cells in vivo. Cytochrome P-450 reductase was shown to be not essential for the cell ferrireductase activity,...