DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Frog skin. Light micrograph of a section through the skin of an African clawed frog (Xenopus laevis). The surface (red) of the epidermis consists of flattened cells. Beneath this are mucus glands (with purple nuclei). The mucus covers the frog's skin, keeping it moist. Black cells in this layer are chromatophores (pigment cells), which can expand and contract to change the colour of the skin. The large round structures are poison glands. Magnification: x10 when printed at 10 centimetres wide.
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