14890
In contrast, U-937 cells induced by RA strongly increased their expression of CD23 mRNA and protein, whereas they completely lacked detectable CD14 cell surface or mRNA expression .
 ( RNA: CD23 mRNA, None) , ( protein: CD23, None) , ( cell line: U-937 cells, 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: CD23 mRNA, None) , ( protein: CD23, None) , ( cell line: U-937 cells, None) 