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The LY294002 study showed that proliferation and viability of both HCD57-SREI and HCD57 cells correlated with the activity of PKB/Akt ; however, PKB/Akt activity alone did not protect these cells from apoptosis .
 PKB/Akt, PKB/Akt, HCD57 cells, HCD57-SREI
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:
 PKB/Akt, PKB/Akt, HCD57 cells, HCD57-SREI