LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Artwork of the human erythropoietin (EPO) hormone molecule (yellow) bound to receptors (pink). 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.
Model release not required. Property release not required.