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Expression patterns of the CRE-family genes. (A) RNA gel blot hybridizations (5 μg of RNA) from different tissues of WT plants, probed with gene-specific probes for CRE1, AHK2, or AHK3. 1, rosette leaves; 2, roots; 3, floral bunches; 4, siliques. (B) Expression of the GUS reporter gene under control of regulatory sequences from cytokinin-receptor genes. (B and E) CRE1::GUS activity. (C and F) AHK2::GUS activity. (D and G) AHK3::GUS activity. (Bars = 2 mm.)
