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 C10 Nervous System Diseases D009422 +
  C10.597 Neurologic Manifestations D009461 +
   C10.597.606 Neurobehavioral Manifestations D019954 +
    C10.597.606.643 Mental Retardation D008607 
      C10.597.606.643.180 Cri-du-Chat Syndrome D003410 
      C10.597.606.643.210 De Lange Syndrome D003635 
      C10.597.606.643.220 Down Syndrome D004314 
      C10.597.606.643.690 Prader-Willi Syndrome D011218 
      C10.597.606.643.700 Rubinstein-Taybi Syndrome D012415 
      C10.597.606.643.969 WAGR Syndrome D017624 
      C10.597.606.643.970 Williams Syndrome D018980 
      C10.597.606.643.455 Mental Retardation, X-Linked D038901 +

 C23 Pathological Conditions, Signs and Symptoms D013568 +
  C23.888 Signs and Symptoms D012816 +
   C23.888.592 Neurologic Manifestations D009461 +
    C23.888.592.604 Neurobehavioral Manifestations D019954 +
     C23.888.592.604.646 Mental Retardation D008607 

 F01 Behavior and Behavior Mechanisms D001520 +
  F01.700 Neurobehavioral Manifestations D019954 +
   F01.700.687 Mental Retardation D008607 

 F03 Mental Disorders D001523 +
  F03.550 Mental Disorders Diagnosed in Childhood D019952 +
   F03.550.600 Mental Retardation D008607