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The present study investigated the effect of COX - 2 and molecular mechanisms by DHA in PMA stimulated RAW 264 . 7 cells .
 Chemical: DHA; Chemical: PMA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: DHA; Chemical: PMA