Effects of over-expression (OVEX) of the C-terminal FLAG-tagged ZAR2 in synchronized MCF7 cells on the BRCA2 and ZAR2 mRNA levels (A) and on the activities of BRCA2 and ZAR2 gene promoters (B) at the S/G2 phase. MCF7 cells were stably transfected with C-terminally FLAG-tagged ZAR2 and evaluated for their ZAR2 over expression. Levels of the mRNAs were determined by real-time RT-PCR . Promoter activities were measured in MCF7 cells transiently transfected with the single-reporter constructs (Fig. 1B) following the dual luciferase assay protocols (Promega). pGL3-Control was used as normalization control as described in the 'Methods' section. Results are mean ± SE (n = 6). '*' indicates the difference between the corresponding control and the experimental sets is statistically significant (p < 0.001).