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Peripheral blood mononuclear cells ( PBMCs ) are a good model for studies of GR in humans .
 PBMCs, GR, Peripheral blood mononuclear cells
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:
 PBMCs, GR, Peripheral blood mononuclear cells