ID 3.4.21.73 DE u-plasminogen activator. AN cellular plasminogen activator. AN urinary plasminogen activator. AN urokinase. CA Specific cleavage of Arg-|-Val bond in plasminogen to form plasmin. CC -!- Formed from the inactive precursor by action of plasmin or plasma CC kallikrein. CC -!- Differs in structure from EC 3.4.21.68, and does not bind to fibrin. CC -!- Belongs to peptidase family S1. CC -!- Formerly EC 3.4.21.31 and EC 3.4.99.26. DR Q05589, UROK_BOVIN ; P15120, UROK_CHICK ; P00749, UROK_HUMAN ; DR P06869, UROK_MOUSE ; P16227, UROK_PAPCY ; P04185, UROK_PIG ; DR Q5RF29, UROK_PONAB ; Q8MHY7, UROK_RABIT ; P29598, UROK_RAT ; //