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NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY NICOLLE R. FULLER / SCIENCE PHOTO LIBRARY
Von Willebrand factor (vWF). Illustration of research being carried out into vWF, a glycoprotein found in blood plasma. The protein is attached to two beads, one (grey sphere) held by a pipette tip (left), the other (blue sphere) attached to the protein's platelet receptor and held and controlled by a laser. The protein binds to collagen exposed in damaged epithelial cells. This produces a change in the shape of the protein that starts a cascade of signals that begin the clotting process.
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