6986
USF/c-Myc enhances, while Yin-Yang 1 suppresses, the promoter activity of CXCR4 , a coreceptor for HIV-1 entry .
 coreceptor, USF/c-Myc, CXCR4, Yin-Yang 1
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:
 coreceptor, USF/c-Myc, CXCR4, Yin-Yang 1