CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Close-up illustration showing a cross-section of a cancerous breast cell producing too many HER genes, which in turn produce an excessive number of HER2 receptors. The receptors attract growth factors, which stimulate the growth of more cells. Herceptin (generic name: Trastuzumab) and other antibodies inhibit HER2 receptors and VEGF growth factors. They also attract other elements of the immune system such as the killer cell pictured upper left.
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