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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 +
       A08.186.211.132.659.237 Corpora Quadrigemina D003336 +
       A08.186.211.132.659.473 Locus Coeruleus D008125 
       A08.186.211.132.659.632 Raphe Nuclei D011903 
       A08.186.211.132.659.687 Substantia Nigra D013378 
       A08.186.211.132.659.822 Tegmentum Mesencephali D013681 +