2352
A DNA fragment containing 128 bp of upstream sequence had strong, monocyte-specific promoter activity in the CD14 positive monocytic cell line Mono Mac 6 as compared to the nonmonocytic cell lines HeLa and REX .
 CD14 positive monocytic cell line, DNA fragment, CD14, 128 bp of upstream sequence, Mono Mac 6, nonmonocytic cell lines, REX, HeLa
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:
 CD14 positive monocytic cell line, DNA fragment, CD14, 128 bp of upstream sequence, Mono Mac 6, nonmonocytic cell lines, REX, HeLa