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lacs4 and lacs4 ibr3 display reduced IBA-responsive DR5 activation. Staining of DR5:GUS in root tips of 5-d-old seedlings. Plants were incubated in liquid PN with or without hormone gently rocking for 2 h. Plants were stained for GUS for 3 h at 37°C and washed with 50, 75, and 95% EtOH before imaging. Groups were imaged with a 20× objective, inset is 40× objective.
