ADAMTS13 (A Disintigrin And Metalloproteinase with a ThromboSpondrin type 1 motif, member 13) is an enzyme that regulates clotting. Its function is to regulate von Willebrand factor, which when unrestricted results in thrombotic thrombocytopenic purpura, usually when immunoglobulin G restricts the production of this enzyme.

ADAMTS13 at Wikipedia

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