ScFKBP transgene expression leads to rapamycin susceptibility. A. GUS staining of an hemizygote for a T-DNA insertion within AtTOR  showing the expression of the AtTOR-GUS fusion protein, Scale bar 1 cm. Insert: close-up view of the primary root meristem. B and C, Primary root length measurment of 4 ScFKBP12 expressing lines compared with WT with 10 μg/ml of rapamycin (grey) or without rapamycin (white). A, 4 days after germination. B, 10 10 days after germination. The means of 20 roots are shown, with standard error of the mean indicated by the bars. B. Primary root length measurement. D. Picture of the 25 c line depicted in C. Scale bar 1 cm.