TMSB15A and TMSB15B RNA expression are differentially regulated by TGFB1. MCF-7 breast cancer cells were treated with 10 ng/ml TGFB1 or control conditions for 24 or 48 hrs. qPCR was used to assess RNA expression of TMSB15A and TMSB15B. TMSB15A levels (black bars, marked ‘A’) were significantly inhibited by TGFB1, while no effect was observed on TMSB15B (striped bars, marked ‘B’), * P < 0.05, ** P < 0.01. Fold change relative to RPS9 housekeeping gene expression and error bars indicate standard deviation of replicate samples.