MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY
Blood vessel formation. Illustration showing a malignant (cancerous) tumour (pink) promoting the formation of new blood vessels. The tumour releases angiogenic growth factor proteins, such as vascular endothelial growth factor (VEGF), that encourage the growth of new blood vessels from existing ones. These blood vessels provide the cell with oxygen and nutrients.
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