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We investigated oligonucleotide -directed triple helix formation across this regulatory sequence as a potential tool to inhibit GM-CSF gene transcription .
 GM-CSF, regulatory sequence
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:
 GM-CSF, regulatory sequence