6870
Constitutive activations of PKB/Akt , STAT5a , and STAT5b were noted in these EPO -independent cells .
 STAT5a, EPO -independent cells, EPO, STAT5b, PKB/Akt
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:
 STAT5a, EPO -independent cells, EPO, STAT5b, PKB/Akt