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Although further studies are required to determine the precise role of PEBP2 in the GM - CSF promoter activity , the present findings suggested the importance of the relative ratio of different PEBP2 isoforms in regulating the levels of the promoter activity .
 PEBP2, GM - CSF promoter, PEBP2 isoforms
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PEBP2, GM - CSF promoter, PEBP2 isoforms