5225
Ten mutants of the simian immunodeficiency virus ( SIV ) SIVmac239 bearing deletions (delta) or substitutions (subst) in the NF-kappaB and/or Sp1 binding elements were created, and the replicative capacities of the mutants were analyzed.
 Sp1 binding elements, Sp1, NF-kappaB
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:
 Sp1 binding elements, Sp1, NF-kappaB