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Auxin-related defects in the tir2 mutant. A, Number of lateral roots on 10-d-old Col-0 and tir2-1 plants. B, Gravity response of Col-0 and tir2-1 roots. Seedlings were grown in a vertical orientation for 7 d and reoriented at time 0. C and D, Response of hypocotyls (C) and petioles (D) to increased temperature.
