14256
Here we have investigated the transcriptional regulation of the gamma chain gene by analyzing the 2.5-kilobase sequence upstream of the transcription start site .
 ( DNA: 2.5-kilobase sequence, None) , ( DNA: transcription start site, None) , ( protein: gamma 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:
 ( DNA: 2.5-kilobase sequence, None) , ( DNA: transcription start site, None) , ( protein: gamma chain, None) 