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Callus growth of wild-type (WT), smo1-1/+ smo1-2, and smo1-1 smo1-2/+ root segments. A to O, Root segments were cultured on MS medium containing 450 nm 2,4-d plus different concentrations of kinetin. After 21 d in culture, the induced calli were photographed. Bars = 1 mm. (P) Callus weight at 30 d postculture. n = 14.
