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Lateral root formation in response to auxin treatment of wild-type and ggb seedlings. Ws, ggb-1, Col, and ggb-2 seedlings were grown on vertically oriented plates in the presence of various concentrations of α-naphthalene acetic acid (α-NAA) for 4 d and scored for number of lateral roots. Standard error of the mean is shown for all data points. Asterisks indicate significant differences determined by Student's t test (P < 0.01, right panel; P < 0.05, left panel).
