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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 ).
 professional APCs, major histocompatibility complex (MHC) class II antigens, IFN-gamma, interferon-gamma, APCs, professional antigen presenting cells, fibroblasts, APCs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 professional APCs, major histocompatibility complex (MHC) class II antigens, IFN-gamma, interferon-gamma, APCs, professional antigen presenting cells, fibroblasts, APCs