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Sensitivity of the mkp1 mutant to genotoxic stress and its complementation by ectopic expression of AtMKP1. (A) Five-day-old seedlings were transferred to liquid medium supplemented with methyl methanesulfonate (MMS) at the concentrations indicated. The picture was taken after 3 wk of further growth. (B) Root growth after UV-C irradiation of 5-day-old seedlings with 500 J/m2. Ws: Wassilewskija wild type; mkp1 mutant; line 6: mkp1 complemented by ectopic expression of AtMKP1.
