10578
This employs an Escherichia coli tester strain carrying a modified lac operon as a reporter gene , with the lac operator sequence replaced by an octamer sequence .
 octamer sequence, reporter gene, modified lac operon
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:
 octamer sequence, reporter gene, modified lac operon