Semiquantification of Bcl-2, Bcl-XL, and STAT5 expression with a densitometric assay based on levels of β-actin expression.

(A) Summary of data for three 32D/TREx/Ik6 clones. Note the more than 4-fold increase in Bcl-XL expression at 24 hours of incubation in the presence of tetracycline (**P < .01). (B) Summary of data for 2 Cos-7/pRC/CMV/Ik2/TREx/Ik6 clones. The increases in Bcl-XL expression at 16 and 24 hours of incubation significantly exceeded the baseline value (0 hour; **P < .001 for both comparisons). Measurements are presented as mean with SEs (bars).