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Phytochelatin synthase (PCS) catalyzes the synthesis of phytochelatins (PCs), which play a detoxification role in higher plants. Heterologous expression of CmPCS, a product of a PCS-like gene from the genomic DNA of the red alga Cyanidioschyzon merolae, rescued Cd2+-sensitive yeast from Cd2+ toxicity. The fact that these transformed cells synthesized PCs demonstrates that CmPCS is functional.
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