STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Myelinated nerve fibres, coloured scanning electron micrograph (SEM). The myelin sheath is pink, the axoplasm is dark brown and the endoneurium (connective tissue) is yellow. Magnification: x3300 when printed at 10 centimetres wide.
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