CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration of a growth factor, a protein or a steroid hormone capable of stimulating cellular proliferation and differentiation. Growth factors are important for regulating a variety of cellular processes. They can also proliferate to the point where they overstimulate cell growth resulting in cancer. Receptors are shown attached to the bilipid membrane of a cell.
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