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Two serine proteases, urokinase and tissue type, control the activation of plasminogen to plasmin. These proteases are in turn specifically inhibited by plasminogen activator inhibitors type 1 and 2 (PAI-1 and PAI-2), both of which belong to the serine protease inhibitor (serpin) superfamily. Very little information is available on the role of PAI-1 and PAI-2 in ruminants, in mammary gland involution...
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