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Promoter activities of the RGFR1, RGFR2, and RGFR3 genes. GUS activity is evident in the proximal meristem and the elongation zone of proRGFR1:GUS plants and proRGFR2:GUS plants, and in the elongation zone and differentiation zone of proRGFR3:GUS plants 5 d after germination (DAG). (Scale bar, 100 μm.)
