Herceptin breast cancer drug molecule

Herceptin breast cancer drug molecule

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Caption: Herceptin breast cancer drug. Molecular model of Herceptin (Trastuzumab), showing the molecule's secondary structure, seen as alpha helices (coils) and beta sheets (arrows). Herceptin binds to HER2 (human epidermal growth factor receptor 2), a receptor that is over-expressed in some breast cancer cells, making them grow faster and more likely to spread. Herceptin blocks HER2, which kills the breast cancer cells. Around a fifth of breast cancers result from cells that over-express HER2, making them viable for Herceptin treatment.

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