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Platelet-activating factor stimulates transcription of the heparin-binding epidermal growth factor-like growth factor in monocytes .
 monocytes, heparin-binding epidermal growth factor-like growth factor, Platelet-activating factor
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:
 monocytes, heparin-binding epidermal growth factor-like growth factor, Platelet-activating factor