#auxin  a plant hormone that promotes root formation and bud growth
  supertype:  phytohormone__plant_hormone__planthormone__growth_regulator  a hormone-like plant product
  subtype:  indoleacetic_acid__IAA  a plant hormone promoting elongation of stems and roots
  subtype:  indolebutyric_acid__indolebutyricacid  a synthetic plant hormone promoting elongation of stems and roots

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