11634
The expression of major histocompatibility complex (MHC) class II antigens is constitutive in professional antigen presenting cells ( APCs ) but can also be induced by interferon-gamma ( IFN-gamma ) on the majority of the non professional APCs (e.g. fibroblasts ).
 ( cell type: professional APCs, None) , ( protein: major histocompatibility complex (MHC) class II antigens, None) , ( protein: IFN-gamma, None) , ( protein: interferon-gamma, None) , ( cell type: APCs, None) , ( cell type: professional antigen presenting cells, None) , ( cell type: fibroblasts, None) , ( cell type: APCs, 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: professional APCs, None) , ( protein: major histocompatibility complex (MHC) class II antigens, None) , ( protein: IFN-gamma, None) , ( protein: interferon-gamma, None) , ( cell type: APCs, None) , ( cell type: professional antigen presenting cells, None) , ( cell type: fibroblasts, None) , ( cell type: APCs, None) 