STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Frog skin. Coloured scanning electron micrograph (SEM) of the skin of a frog, showing numerous folds (microplicae). These folds maximise the surface area to allow for increased cutaneous gas exchange. Magnification: x3000 when printed 10 centimetres wide.
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