recently we presented evidence that normal human foreskin fibroblasts ( hf cells ) limit the activity of secreted urokinase by secreting it as a proenzyme and by secreting protease nexin , an inhibitor of urokinase and certain other serine proteases ( scott , r.w. , eaton , d. l. duran , n. , and baker , j.b. ( 1983 ) j. biol . chem . 258 , 4397-4403 ) .
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human
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urokinase