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Text File  |  1992-09-01  |  251b  |  7 lines
  1. The insulating layer that surrounds nerve
  2. cells in vertebrate animals. It acts to speed
  3. up the passage of nerve impulses. Myelin is
  4. made up of fats and proteins and is formed
  5. from up to a hundred layers, laid down by
  6. special cells, the Schwann cells.
  7.