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The enhanced ethylene response of eer1 is restricted to the basal portion of the hypocotyl. Confocal microscopy of dark-grown wild-type and eer1 seedlings treated with either 10 μm AVG or 10 μL L−1 ethylene for 3.5 d. Top two sets, The cotyledons, apical hook, and apical portion of the hypocotyl (10× magnification). Bottom, The transition zone between the apical hook region and basal portion of the hypocotyl (20× magnification).
