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We previously demonstrated that while NE by itself does not activate human platelets , it strongly enhances the weak aggregation induced by a threshold concentration of cathepsin G (threshold of cathepsin G ) (Renesto, P., and Chignard, M. (1993) Blood 82, 139-144).
 human platelets, cathepsin G, NE, cathepsin G
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:
 human platelets, cathepsin G, NE, cathepsin G