7259
Both the parental and the oncogene expressing fibroblasts similarly triggered phosphoinositide hydrolysis in the bound NK cells , demonstrating that NK cells were cytolytically activated in contact with both resistant parental and oncogene expressing sensitive target fibroblasts .
 NK cells, NK cells, oncogene expressing fibroblasts, oncogene expressing sensitive target fibroblasts
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:
 NK cells, NK cells, oncogene expressing fibroblasts, oncogene expressing sensitive target fibroblasts