14697
All sequence motifs within the functional core of HS-40 , as mapped by transient expression analysis, appeared to bind a nuclear factor (s) in living K562 cells but not in nonerythroid cells .
 nuclear factor, nonerythroid cells, K562 cells, HS-40
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:
 nuclear factor, nonerythroid cells, K562 cells, HS-40