STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Cyanobacteria. Coloured scanning electron micrograph (SEM) of Microcoleus sp. (left) and Anabaena sp. (spheres, right) filamentous cyanobacteria (blue-green algae). Anabaena produces several types of toxins that can affect the nervous system and the liver. Magnification: x 5000, when printed 10 centimetres wide.
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