serum

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serum Clear liquid left after the protein has been clotted; the serum from milk, occasionally referred to as lacto‐serum, is whey.

Blood serum is blood plasma without the fibrinogen. When blood clots, the fibrinogen is converted to fibrin, which is deposited in strands that trap the red cells and form the clot. The clear liquid that is exuded is the serum. See also blood clotting.

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