Blood fractionation
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Blood fractionation is the process of fractionating the blood - that is, of separating it into its component parts: erythrocytes (or "red blood cells"), blood plasma, and platelets. The first practical large-scale method of blood fractionation was developed by Edwin J. Cohn during the Second World War. Also known as plasma fractionation or the Cohn method.
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the whole blood can be cetrifuged to get a clear suspension of "plasma" in the upper phase, the WBC's in the middle buffy coat and the erythrocytes in the bottom.
