10893
To understand the molecular mechanisms controlling CD19 gene expression , we isolated and functionally characterized the CD19 promoter using in vivo footprinting , gel shift assays , and transfection studies .
 ( protein: CD19, None) , ( protein: CD19, None) , ( DNA: CD19 promoter, 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: CD19, None) , ( protein: CD19, None) , ( DNA: CD19 promoter, None) 