Q:

Many facial malfonnations are believed due to:

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Many facial malfonnations are believed due to:


  1. a failure of the oral membrane to rupture
  2. a failure of neural crest cells to migrate into the facial processes
  3. a failure in growth of the head fold
  4. an abnonnal persistence of the pharyngeal clefts
  5. none of the above (A-D)

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B. a failure of neural crest cells to migrate into the facial processes

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