structure of the nail

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Across
  1. 2. lies under the free edge
  2. 4. lies directly underneath the nail plate
  3. 5. non living tissue
  4. 7. made up of keratin
Down
  1. 1. protects the matrix from infection
  2. 3. living part of the nail
  3. 6. extension of the nail plate
  4. 8. half moon that is partly keratinised