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Fig. 4. Tissue-specific regulation of PIN gene expression by auxin. (A) Quantitative RT-PCR showing upregulation of PIN gene expression in cotyledons, hypocotyls and roots following auxin treatment (10 µmol/l NAA for 3 hours). Induction of PIN gene expression is depicted relative to the non-induced controls. (B-D) Induction of PIN1::GUS (1 µmol/l, B), PIN3::GUS (0.5 µmol/l, C) and PIN4::GUS (0.5 µmol/l, D) expression in cotyledons, hypocotyls and roots after growing the plants for 4 days on medium containing NAA.





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