3357
IEF-1 , a pancreatic beta-cell type-specific complex believed to regulate insulin expression , is demonstrated to consist of at least two distinct species, one of which does not contain Pan molecules .
 IEF-1, Pan molecules
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:
 IEF-1, Pan molecules