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Kinetics of the positive phototropic response of a typical WT root in response to continuous unilateral red illumination as measured with the feedback system (Mullen et al., 2000). The plot shows the rotation of the stage necessary to keep the root tip constrained at 0° (vertical). In all figures, 0 h represents the time at which the seedlings are exposed to unilateral red illumination. This experiment was repeated 20 times with similar results.
