DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Eel skin. Polarised light micrograph of skin from a European eel (Anguilla anguilla). The eel is a fish that has extremely small scales embedded in its skin. Fish scales arise from the skin of a fish. They are made from dentine, and are similar to teeth and hair. An eel's scales are arranged in small groups, forming patterns as seen here. In the near-absence of scales, mucus is secreted to protect the skin. This makes eels very slippery to handle, hence the phrase 'slippery as an eel'. Pacific hagfish. Magnification: x37 when printed at 10 centimetres wide.
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