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Microcystin LR. which is a monocyclic heptapeptide containing two L-amino acids, and leucine and arginine, is a new inhibitor of protein phosphatases 1 and 2A. Microcystin LR-affinity chromatography was used to purify protein phosphatase 2A as a holoenzyme. Five mg of microcystin LR were immobilized to ECH Sepharose 4B by the carbodiimide coupling reaction. Following DEAE-cellulose column chromatography,...
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