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Northern blot analysis showed that TCDD treatment decreased steady state levels of CD19 mRNA by 67% in the IM-9 cell line .
 ( RNA: CD19 mRNA, None) , ( cell line: IM-9 cell line, 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:
 ( RNA: CD19 mRNA, None) , ( cell line: IM-9 cell line, None) 