2908
Two multicopy basal enhancer motifs within the SCMV MIE enhancer , namely, 11 copies of the 16-bp cyclic AMP response element ( CRE ) and 3 copies of novel 17-bp serum response factor ( SRF ) binding sites referred to as the SNE ( SRF/NFkappaB-like element ), as well as four classical NFkappaB sites within the HCMV version, contribute to TPA responsiveness in transient assays in monocyte and T- cell types .
 SRF, MIE enhancer, NFkappaB sites, CRE, serum response factor, SNE, cyclic AMP response element, SRF/NFkappaB-like element, MIE, serum response factor ( SRF ) binding sites, multicopy basal enhancer motifs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 SRF, MIE enhancer, NFkappaB sites, CRE, serum response factor, SNE, cyclic AMP response element, SRF/NFkappaB-like element, MIE, serum response factor ( SRF ) binding sites, multicopy basal enhancer motifs