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Prostaglandin E2 ( PGE2 ), a pleiotropic immunomodulatory molecule , is observed at elevated levels during HIV-1 infection as well as during the course of other pathogenic infections.
 pleiotropic immunomodulatory molecule
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:
 pleiotropic immunomodulatory molecule