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Quantification of protein tyrosine nitration in leaves of resistant (A) and susceptible (B) potato inoculated with P. infestans. Analyses were performed at 1, 3, 6, 24, 48, 72, and 96 h after challenge inoculation. Values represent the mean ± SD of at least three independent experiments (n = 9). Asterisks indicate values that differ significantly from mock inoculated (control) potato leaves at ∗P < 0.05.
