1129
Human RAR alpha was expressed in H9 , U937 and THP-1 cells , but almost undetectable in CEM cells .
 ( protein: Human RAR alpha, None) , ( cell line: H9, None) , ( cell line: THP-1 cells, None) , ( cell line: CEM cells, None) , ( cell line: U937, 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: Human RAR alpha, None) , ( cell line: H9, None) , ( cell line: THP-1 cells, None) , ( cell line: CEM cells, None) , ( cell line: U937, None) 