5531
METHODS: CD23 was cross-linked in human monocytes and U937 cells with IgE immune complexes .
 ( cell type: human monocytes, None) , ( cell line: U937 cells, None) , ( protein: CD23, None) , ( protein: IgE immune complexes, 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:
 ( cell type: human monocytes, None) , ( cell line: U937 cells, None) , ( protein: CD23, None) , ( protein: IgE immune complexes, None) 