Fig. 3. Structure and expression of mutant Sbf1 proteins. (A) A schematic depiction of wild-type Sbf1 is shown at the top. Bars depict amino acid compositions of various Sbf1 deletion mutants. (B) Western blot analysis with an anti-Sbf1 monoclonal antibody demonstrates equivalent expression of Sbf1 deletion constructs in stably transfected NIH 3T3 cell lines.