2381
Sequence homology, single nucleotide mutations , and anti- CD28 Ab stimulation studies established that the NF-kappa B -like sequence in the promoter of the IL-8 gene functioned as a CD28 response element .
 ( DNA: CD28 response element, None) , ( DNA: IL-8 gene, None) , ( protein: IL-8, None) , ( protein: CD28, None) , ( protein: CD28, None) , ( DNA: promoter, None) , ( DNA: NF-kappa B -like sequence, None) , ( protein: NF-kappa B, None) , ( protein: anti- CD28 Ab, 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: CD28 response element, None) , ( DNA: IL-8 gene, None) , ( protein: IL-8, None) , ( protein: CD28, None) , ( protein: CD28, None) , ( DNA: promoter, None) , ( DNA: NF-kappa B -like sequence, None) , ( protein: NF-kappa B, None) , ( protein: anti- CD28 Ab, None) 