Figure 5. The BRE-SBE elements are sufficient for serum induction.
A) Four copies of the indicated elements of the mId1 promoter were cloned upstream of the SV40 promoter in the pGL3 luciferase reporter. B) These constructs were co-transfected with pRLS40P into NIH 3T3 cells, serum-induced and assayed as in figure 3.