6737
Oligoclonal expansion of B cells in the livers with ILFs was confirmed by an analysis of immunoglobulin heavy chain ( IgH ) gene rearrangement determined by polymerase chain reaction ( PCR ).
 ( cell type: B cells, None) , ( DNA: immunoglobulin heavy chain ( IgH ) gene, None) , ( protein: IgH, None) , ( protein: immunoglobulin heavy chain, 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 type: B cells, None) , ( DNA: immunoglobulin heavy chain ( IgH ) gene, None) , ( protein: IgH, None) , ( protein: immunoglobulin heavy chain, None) 