Its all about teeth

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Across
  1. 3. HOX
  2. 5. MUC
  3. 6. alpha AMYL
  4. 8. ENAM
  5. 11. AMELX
  6. 12. DLS
Down
  1. 1. KLK
  2. 2. PKD
  3. 4. TUFT
  4. 7. AMBN
  5. 9. AQP
  6. 10. R in the RUNX2