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Ribonucleotide (cytidine 5'-diphosphate) reductase activity can be detected in situ in cells of the blue-green alga Agmenellum quadruplicatum, strain PR-6, after the cells are made permeable by treatment with ether. The Agmenellum reductase resembles the enzyme from Escherichia coli.
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Gleason et al. (1976) studied this question.
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