Direct effect of tenascin-C isoform expression on tumour cell growth. (a) Growth of MCF-7, MDA-MB-231 and T-47 D cell lines transfected with three different tenascin-C (TNC) constructs and a vector control. Bars represent the mean relative cell count compared with 0 hours, with each assay performed three times in triplicate; error bars shown. (b) Images of cells transfected with three different TNC constructs. Images were taken using a 4× magnification in exactly the same position in each well. **P < 0.01, ***P < 0.001.