1566
No genomic changes were found, and a CAT reporter gene with the CD18 promoter was inactive in the 3 of them, again suggesting lack of (a) transcriptional factor (s) necessary for CD18 expression .
 ( protein: transcriptional factor, None) , ( DNA: CD18 promoter, None) , ( DNA: CAT reporter gene, None) , ( protein: CD18, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: transcriptional factor, None) , ( DNA: CD18 promoter, None) , ( DNA: CAT reporter gene, None) , ( protein: CD18, None) 