character: Cyanobacteria
topic: Photosynthetic Nitrogen-Fixing Bacteria
subject: Science
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character: Anabaena
topic: Symbiotic Nitrogen-Fixing Cyanobacteria
subject: Science
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character: Nostoc
topic: Cyanobacteria in Aquatic Ecosystems
subject: Science
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character: Aphanizomenon
topic: Impact of Cyanobacteria on Nitrogen Cycling
subject: Science
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