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Antiheparin Factor

A CXC chemokine that is found in the alpha granules of Platelets. The protein has a molecular size of 7800 kDa and can occur as a monomer, a dimer or a tetramer depending upon its concentration in solution. Platelet factor 4 has a high affinity for Heparin and is often found complexed with Glycoproteins such as Protein C.