STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Red blood cell and bacteria. Coloured scanning electron micrograph (SEM) of a crenated red blood cell (red) surrounded by Escherichia coli (E. coli) bacteria. Crenation is caused by dehydration, which distorts the cell and leads to a severe reduction in its ability to carry out its function. Magnification: x400 when printed at 10 centimetres wide.
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