9615
CD20 is a B-lineage-specific gene expressed at the pre-B-cell stage of B-cell development that disappears on differentiation to plasma cells .
 ( cell type: plasma cells, None) , ( DNA: B-lineage-specific gene, None) , ( protein: CD20, 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: plasma cells, None) , ( DNA: B-lineage-specific gene, None) , ( protein: CD20, None) 