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ABA- or MJ-induced stomatal closing (A) in the presence of the protein kinase inhibitors K252a (B), ML7 (C), and the calmodulin antagonist W7 (D). Stomata of leaf epidermis were allowed to open in light for 2 h, and then incubated for 2 h in ABA or MJ. K252a, ML7, and W7 were added 30 min before the addition of ABA or MJ. Results are the averages ± se (n = 60) from at least 3 independent experiments.
