Task: Text Categorization
Input (English): Flurprimidol and ancymidol are two chemicals that inhibit synthesis of these compounds, whose precursors include ent-kaurene. PIF3/4 is a transcription factor whose activity is regulated by these compounds through their promotion of ubiquitination of DELLA proteins. A bioassay for these compounds using barley endosperm relies on their stimulation of hydrolytic enzymes in germinating cereal grains. Teijiro Yabuta and Eiichi Kurosawa named and discovered these compounds during studies of foolish seedling disease. For 10 points, name this class of plant hormones that break dormancy and stimulate cell elongation.
Output (English): Science