All

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 H01 Natural Sciences D010811 +
  H01.770 Science D012586 +
   H01.770.644 Research D012106 +
    H01.770.644.145 Biomedical Research D035843 +
     H01.770.644.145.100 Animal Experimentation D032761 +
      H01.770.644.145.100.100 Animal Use Alternatives D023401 +
       H01.770.644.145.100.100.100 Animal Testing Alternatives D000826