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Relative auxin transport activity in hypocotyls of young seedlings The ABC transporter mutation atpgp1-1 exhibits slightly reduced polar auxin transport under these conditions shown, whereas the atpgp19-1 (atmdr1-1) exhibits markedly reduced polar auxin transport. Auxin transport in the double atpgp1-1/atpgp19-1 (atmdr1-1) mutant was dramatically impaired. The twd1-1 mutant showed even less polar auxin transport activity.
