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Second, we found that the potentiating activity of NE on the threshold of cathepsin G -induced platelet aggregation was strictly dependent on the presence of exogenous fibrinogen .
 cathepsin G, exogenous fibrinogen, NE
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cathepsin G, exogenous fibrinogen, NE