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Expression of ER mRNA following transfection with BRCA1 or pRK7. Cells were harvested 48 h after transfection and mRNA for RT-PCR analysis were prepared. PCR products from the RT-PCR analysis were run on an agarose gel for analysis of ER mRNA, with the products appearing at the expected size of 603 bp (arrow). Reverse transcriptase (RT) reactions were performed with or without RT to control for contamination, and mRNA prepared from untransfected MCF7 cells serving as positive control
