4971
Plasmids containing 151 bp of 5'-flanking sequences confer myeloid-cell-specific gene expression .
 151 bp, 5'-flanking sequences
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:
 151 bp, 5'-flanking sequences