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We found that erythropoietin ( EPO ) and stem cell factor ( SCF ) activated protein kinase B ( PKB/Akt ) in EPO -dependent HCD57 erythroid cells .
 activated protein kinase B, EPO -dependent HCD57 erythroid cells, EPO, PKB/Akt, SCF, stem cell factor, EPO, erythropoietin
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:
 activated protein kinase B, EPO -dependent HCD57 erythroid cells, EPO, PKB/Akt, SCF, stem cell factor, EPO, erythropoietin