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Tolerance of single, double, and triple mutants of CHK1, CHK2, and CHK3 to a high dose of cytokinin in comparison with the wild type. Seven-week-old cultures grown on KNOP agar plates. (A–H) No exogenous cytokinin, (I–Q) 1 µM benzyladenine (BA). All pictures are at the same scale; the scale bar is given in (A).
