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We first isolated two overlapping cosmids encoding human CIITA which, when co-transfected, are able to restore MHC class II expression in a B-lymphoblastoid cell line ( B-LCL ) defective for CIITA .
 ( DNA: cosmids, None) , ( protein: MHC class II, None) , ( cell line: B-lymphoblastoid cell line, None) , ( protein: CIITA, None) , ( protein: human CIITA, None) , ( cell line: B-LCL, 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:
 ( DNA: cosmids, None) , ( protein: MHC class II, None) , ( cell line: B-lymphoblastoid cell line, None) , ( protein: CIITA, None) , ( protein: human CIITA, None) , ( cell line: B-LCL, None) 