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These data along with previous observations demonstrating the potent immunosuppressive activity of TGF-beta 2 , support a model for a feedback mechanism between the activated T-lymphocytes and astrocytes via TGF-beta 2 to regulate the immune response .
 astrocytes, TGF-beta 2, T-lymphocytes, TGF-beta 2
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:
 astrocytes, TGF-beta 2, T-lymphocytes, TGF-beta 2