12455
However, ILT-mat cells and ATL16T(-) cells , although they were ATL cells , showed rather low surface ICAM-1 expression and ICAM-1 mRNA expression .
 ( protein: ICAM-1, None) , ( cell line: ILT-mat cells, None) , ( cell line: ATL cells, None) , ( cell line: ATL16T(-) cells, None) , ( RNA: ICAM-1 mRNA, None) , ( protein: ICAM-1, 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: ICAM-1, None) , ( cell line: ILT-mat cells, None) , ( cell line: ATL cells, None) , ( cell line: ATL16T(-) cells, None) , ( RNA: ICAM-1 mRNA, None) , ( protein: ICAM-1, None) 