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PEBP2 alpha A1 , alpha B1 , and alpha B2 proteins bound the PEBP2 site within the mouse GM-CSF promoter .
 alpha B2 proteins, PEBP2, alpha B1, PEBP2, alpha A1, PEBP2 site, PEBP2 alpha A1, mouse GM-CSF promoter, GM-CSF
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:
 alpha B2 proteins, PEBP2, alpha B1, PEBP2, alpha A1, PEBP2 site, PEBP2 alpha A1, mouse GM-CSF promoter, GM-CSF