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Interference with cytokinin-controlled PIN1 expression in pac mutants. PIN1::PIN1:GFP expression in root meristem of pac mutants exposed for 6 h to control medium or liquid 0.5× MS medium supplemented with cytokinin (10 µM BAP). The PIN1 expressions are representative of at least 10 analysed root tips of particular pac mutants. PIN1-GFP downregulation on the control media was consistently observed in pac12. Scale bars = 150 µm.
