13842
Transient transfectants of the porcine B-cell line L23 with the mutated CIITA constructs were tested for the suppression of constitutive SLA-DR and SLA-DQ expression .
 ( protein: CIITA, None) , ( DNA: CIITA constructs, None) , ( cell line: porcine B-cell line L23, 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: CIITA, None) , ( DNA: CIITA constructs, None) , ( cell line: porcine B-cell line L23, None) 