6553
Interestingly, when we fused HT-2 cells expressing the EPOR with Ba/F3 cells in a complementation assay , the resulting hybridomas proliferated and potently activated STAT-5 and MAPK in response to EPO .
 STAT-5, MAPK, Ba/F3 cells, EPO, HT-2 cells, hybridomas, EPOR
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:
 STAT-5, MAPK, Ba/F3 cells, EPO, HT-2 cells, hybridomas, EPOR