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Phormidium sp. cyanobacteria, light micrograph
Differential interference contrast (DIC) light micrograph of Phormidium sp. cyanobacteria (formally known as blue-green algae) filaments. Each filament is a colony of bacterial cells. Cyanobacteria are photosynthesising bacteria that are found in most habitats where water is present. They are also used as a health food and dietary supplement because of their high protein content. Magnification: x400 when printed at 10 centimetres wide., Photo by FRANK FOX/SCIENCE PHOTO LIBRARY
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