4733
A 15-base oligonucleotide , GM3 , was targeted to a purine-rich region in the GM-CSF proximal promoter , which overlaps the kappaB element .
 purine-rich region, GM-CSF proximal promoter, GM-CSF, kappaB element
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:
 purine-rich region, GM-CSF proximal promoter, GM-CSF, kappaB element