Figure 9.

β-catenin levels are not reduced during tumor regression. Tumors from control and −MPA-, E₂-, and RU486-treated mice were collected at 72 hours. A and B: Immunofluorescence staining for β-catenin in samples derived from control and RU486-treated mice, respectively. C: Representative Western blot in which a control sample was run together with samples from −MPA-, E₂-, and RU486-treated samples. No differences were detected between the control and treated samples. A doublet at 95 kd was detected as described by other authors.³³ Scale bars, 20 μm.