12552
Altogether, the CD4 gene is regulated by several positive and negative regulatory mechanisms which come into play in a developmentally coordinated manner.
 CD4 gene, CD4
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 gene, CD4