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 G06 Biochemical Phenomena, Metabolism, and Nutrition D001670 +
  G06.535 Metabolism D008660 +
   G06.535.166 Biological Transport D001692 +
    G06.535.166.775 Respiratory Transport D015657 +
      G06.535.166.775.602 Pulmonary Gas Exchange D011659 

 G09 Circulatory and Respiratory Physiology D002943 +
  G09.772 Respiratory Physiology D012143 +
   G09.772.770 Respiratory Physiologic Processes D044703 +
    G09.772.770.755 Respiration D012119 +
     G09.772.770.755.760 Respiratory Transport D015657 +
       G09.772.770.755.760.602 Pulmonary Gas Exchange D011659