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The class II major histocompatibility complex gene HLA-DRA is expressed in B cells , activated T lymphocytes , and in antigen-presenting cells .
 ( DNA: class II major histocompatibility complex gene, None) , ( cell type: B cells, None) , ( cell type: antigen-presenting cells, None) , ( DNA: HLA-DRA, None) , ( protein: class II major histocompatibility complex, None) , ( cell type: T lymphocytes, 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: class II major histocompatibility complex gene, None) , ( cell type: B cells, None) , ( cell type: antigen-presenting cells, None) , ( DNA: HLA-DRA, None) , ( protein: class II major histocompatibility complex, None) , ( cell type: T lymphocytes, None) 