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Kinase-inactive MEKK1 (K361M) rescues the mekk1 dwarf phenotype. A, Three-week-old plants grown on soil at 24°C. Bars = 1 cm. B, Agarose gel of RT-PCR products generated by 22, 32, or 42 PCR cycles using gene-specific primer pairs for PR-1 or an actin control gene. mekk1 + K361M, mekk1-1 mutant stably transformed with MEKK1 (K361M). mekk1 + MEKK1, mekk1-1 mutant stably transformed with the wild-type MEKK1 gene. [See online article for color version of this figure.]
