1130
Human RXR alpha was significantly expressed in U937 and THP-1 cells , weakly expressed in H9 cells and not detectable in CEM cells .
 ( cell line: H9 cells, None) , ( protein: Human RXR alpha, None) , ( cell line: CEM 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:
 ( cell line: H9 cells, None) , ( protein: Human RXR alpha, None) , ( cell line: CEM cells, None) 