After tissue repair is completed, factor XII catalyzes the formation of a plasma enzyme called kallikrein, that in turn converts an inactive plasminogen into , a fibrin-dissolving enzyme that breaks up the clot.

Explanation:

Plasmin is a proteolytic enzyme; that causes clevase of proteins, mainly derived from an inert plasma precursor known as plasminogen. When clots are formed within blood vessels, they removed by the activation of plasminogen to plasmin which may lead to their removal.

Plasmin is released as a zymogen called plasminogen (inactive form) from the liver into the blood stream (systemic circulation).

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.