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A temperature‐sensitive mutant of Arabidopsis, root initiation defective 2‐1 (rid2‐1), is characterized by peculiar defects in callus formation. To gain insights into the requirements for the reactivation of cell division, we analyzed this mutant and isolated the gene responsible, RID2. The phenotypes of rid2‐1 in tissue culture and in seedlings indicated that the rid2 mutation has various (acute...