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Exogenous ATP induces accumulation of GUS stain in the root tips of DR5-GUS seedlings. GUS-stained root tips of DR5-GUS seedlings grown 6 d in NPA at a concentration of: 0 μm (A), 0.1 μm (B), 1 μm (C), and 10 μm (D); or in 2 mm ATP (E), 2 mm ADP (F), 2 mm ITP (G), and 2 mm AMP (H). The pH of ATP was not pre-adjusted.
