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Flg22-triggered stomatal closure. Leaves of the indicated seedlings were untreated, stimulated with flg22, or infected with PtoDC3000 ΔAvrPto/ΔAvrPtoB, and stomatal aperture was measured microscopically as width to length ratio. Depicted are average values; error bars represent ±sd (n = 140 stomata of three independent experiments). Letters indicate significant differences at P < 0.1 (b) or P < 0.05 (c).
