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The chlL gene encodes one subunit of the light-independent protochlorophyllide reductase. A chlL-lacking mutant of the cyanobacterium Plectonema boryanum is unable to synthesize chlorophyll (Chl) in the dark, causing Chl synthesis to become light-dependent as in angiosperms. When the mutant cells were cultivated heterotrophically in the dark, Chl synthesis was arrested and the Chl content decreased...
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