6503
Zymographic and western blot analyses revealed that PUE inhibited the urokinase - type plasminogen activator ( u - PA ) and matrix metalloproteinase - 2 ( MMP - 2 ) enzyme activity , as well as protein expression .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None