8740
We first demonstrate that an HIV-1 provirus ( SF-2 strain ) very effectively replicates in thymocytes cocultured with TEC whereas this provirus , with kappaB sites deleted, fails to replicate.
 kappaB sites, TEC, thymocytes
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:
 kappaB sites, TEC, thymocytes