Expression of Vav1 in human breast cancer cell lines.

<p>Western Blot analysis of Vav1 and estrogen receptors expression in human breast cancer cell lines (ER positive: MCF7 and T47D; ER negative: MDA-MB-231 and MDA-MB-157) and immortalized breast epithelial line 184A1. The blot with anti-α-tubulin antibody served as a loading control (lower panel). Jurkat cells and its derived <i>vav</i>1-null cells (J.Vav1) were used as positive and negative controls for Vav1.