2915
Slight differences in the sequence of the core SRF binding site compared with that of the classical c-Fos promoter serum response element , together with differences in the spacing between the SRF and ETS motifs , appear to account for the inability of the SCMV SNEs to respond to serum induction .
 ( DNA: c-Fos promoter serum response element, None) , ( DNA: core SRF binding site, None) , ( DNA: SCMV SNEs, 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: c-Fos promoter serum response element, None) , ( DNA: core SRF binding site, None) , ( DNA: SCMV SNEs, None) 