Which of the following is an anticoagulant?

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(D) An anticoagulant is a substance that prevents the coagulation (clotting) of blood.$1$. Heparin is a naturally occurring anticoagulant produced by

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All of the above

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(D) An anticoagulant is a substance that prevents the coagulation (clotting) of blood.$1$. Heparin is a naturally occurring anticoagulant produced by mast cells.$2$. Hirudin is a potent natural anticoagulant found in the saliva of leeches ($Hirudo$ $medicinalis$).$3$. $EDTA$ (Ethylenediaminetetraacetic acid) is a chemical chelating agent used in laboratories to prevent blood clotting by sequestering calcium ions.Therefore,all the given options are anticoagulants.

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