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By contrast, memory cells, either in vitro activated helper T cells reverting to a resting state, or CD4+ T (memory) clones , or CD4+CD45RO+ T cells isolated ex vivo, no longer have a silencer .
 ( DNA: silencer, None) , ( cell line: CD4+CD45RO+ T cells, None) , ( cell line: CD4+ T (memory) clones, None) , ( cell line: vitro activated helper T cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: silencer, None) , ( cell line: CD4+CD45RO+ T cells, None) , ( cell line: CD4+ T (memory) clones, None) , ( cell line: vitro activated helper T cells, None) 