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Relative elongation rate in the meristem and zone of elongation in the primary root of 9-d-old Arabidopsis plants. Maximal elongation rate is the peak value from the polynomial fits; average elongation rate is obtained from the linear fit to the velocity within the elongation zone; meristem elongation rate is obtained from the linear fit to the velocity within the elongation zone. Treatments as for Figure 1. Bars are means from six roots ± se.
