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We examined alpha A1 (an alpha A -gene product ) and alpha B1 and alpha B2 (two alpha B -encoded isomers ) for their effects on the GM-CSF promoter .
 alpha B1, alpha A, alpha B, alpha B2, GM-CSF promoter, alpha A1, alpha A -gene product, alpha B -encoded isomers
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 B1, alpha A, alpha B, alpha B2, GM-CSF promoter, alpha A1, alpha A -gene product, alpha B -encoded isomers