12551
Unexpectedly, the CD4 silencer is also active in CD4+ CD8int/- cells of the thymus , implying that an anti-silencer may be required to resume CD4 expression in this cell population.
 CD4+ CD8int/- cells, CD4, CD4 silencer
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:
 CD4+ CD8int/- cells, CD4, CD4 silencer