7701
Fludarabine caused a specific depletion of STAT1 protein (and mRNA) but not of other STATs .
 STATs, STAT1 protein, STAT1
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:
 STATs, STAT1 protein, STAT1