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Early time-course for the gravitropic response of typical Arabidopsis roots. The stage-rotated root was reoriented to a horizontal position by means of the rotating vertical stage. The manually rotated root was removed from the stage, reoriented by hand, and reattached to the vertical stage. The fitted lines are sixth-order polynomials from which latent periods were calculated (r2 = 0.995 and 0.976 for the stage-rotated and manually-rotated samples, respectively).
