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Expression of a rapamycin -resistant mutant of p70(s6k) in T cells could restore rapamycin -suppressed E2F responses .
 T cells, rapamycin -resistant mutant, p70(s6k), E2F
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:
 T cells, rapamycin -resistant mutant, p70(s6k), E2F