The jelly-like mass that results when platelets and fibrin mesh to seal a leaking blood vessel. Bleeding under the skin can cause it to appear a dark color. The gene can be passed on to children. The care is usually given in one place, a Hemophilia Treatment Center, so the professionals can work together. It is caused by a defect in a protein needed for blood clotting.
Plasma contains the clotting factors.
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