2625
This exon was inserted between glutamine-rich regions 2 and 3 , carboxy terminal of a tentative leucine-zipper structure .
 glutamine-rich regions 2 and 3, carboxy terminal, between glutamine-rich regions 2 and 3, leucine-zipper structure
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:
 glutamine-rich regions 2 and 3, carboxy terminal, between glutamine-rich regions 2 and 3, leucine-zipper structure