4899
Our data suggest that interferon-alpha /beta-induced tyrosine phosphorylation increases the stability of a preexisting, latent, STAT1 - STAT2 signaling complex .
 interferon-alpha, STAT2 signaling complex, STAT1, STAT2
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:
 interferon-alpha, STAT2 signaling complex, STAT1, STAT2