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σ-positive and σ-negative cells support transcription from an exogenous promoter-reporter construct. (A) Northern blot analysis of σ expression in breast cancer cell lines. HMEC MCF-10A, positive control. Blots were reprobed with 18S rRNA. (B) σ promoter linked-luciferase activity in σ-positive and σ-negative cells following transient transfection.
