LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Erythropoietin bound to receptors. Molecular model showing the human erythropoietin (EPO) hormone molecule (red) bound to receptors (blue, green). Erythropoietin regulates blood oxygen levels in the body, when levels are low it is released to stimulate the formation of red blood cells. It is used illegally as a performance-enhancing drug.
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