9167
A chimeric TCR gene , comprising an anti-hapten single-chain Ab variable fragment fused to the transmembrane and cytoplasmic regions of the human TCR zeta-chain , was used to determine whether the tetracycline-regulatable system could be used to regulate gene expression in T cells .
 ( protein: anti-hapten single-chain Ab variable fragment, None) , ( DNA: chimeric TCR gene, None) , ( cell type: T cells, None) , ( protein: transmembrane and cytoplasmic regions, None) , ( protein: human TCR zeta-chain, 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:
 ( protein: anti-hapten single-chain Ab variable fragment, None) , ( DNA: chimeric TCR gene, None) , ( cell type: T cells, None) , ( protein: transmembrane and cytoplasmic regions, None) , ( protein: human TCR zeta-chain, None) 