FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Differential interference contrast light micrograph of a micrasterias sp. desmid. This is a freshwater unicellular green alga that is characteristically symmetrical in structure. Each cell is composed of two mirror-image halves joined by a narrow isthmus. Magnification: x240 when printed 10 centimetres wide.
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