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 A08 Nervous System D009420 +
  A08.186 Central Nervous System D002490 +
   A08.186.211 Brain D001921 +
    A08.186.211.132 Brain Stem D001933 +
     A08.186.211.132.659 Mesencephalon D008636 +
      A08.186.211.132.659.822 Tegmentum Mesencephali D013681 +
        A08.186.211.132.659.822.187 Cerebral Aqueduct D002535 
        A08.186.211.132.659.822.595 Periaqueductal Gray D010487 
        A08.186.211.132.659.822.642 Red Nucleus D012012 
        A08.186.211.132.659.822.820 Ventral Tegmental Area D017557 
        A08.186.211.132.659.822.575 Pedunculopontine Tegmental Nucleus D045042