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Histogram of root-hair length from wild-type (WT) and wer-4 root epidermal cells (n = 150). For wild-type roots, only root hairs from H-position cells were measured. For wer-4 roots, root hairs from cells in the H and N positions were measured separately. For each genotype and position, 15 roots were analyzed. For each root, 10 root hairs from fully mature cells were measured.
