DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Muscle myoblast (primitive embryonic muscle cell) differentiating in to a skeletal muscle cell, coloured scanning electron micrograph (SEM). A myoblast is a type of stem cell that occurs in muscles. Skeletal muscle fibres are made when myoblasts fuse together. As a result muscle fibres have multiple nuclei. Magnification: x1,200 when shortest axis printed at 25 millimetres.
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