1585
Growth arrest occurred at G1 and G2 stages of the cell cycle , indicating that functional EBNA2 is required at different restriction points of the cell cycle .
 EBNA2
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:
 EBNA2