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Microscope slide showing Anabaena, a filamentous cyanobacterium (blue-green alga).
Use this whole mount slide to study the simple structure of Anabaena, a planktonic, filamentous cyanobacterium (blue-green alga). This alga is important to the nitrogen cycle; heterocysts, special nitrogen-fixing cells, convert nitrogen into ammonia. Students can easily identify the enlarged heterocysts and larger spore-like cells called akinetes.