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It is well established that the two major glial cells in the central nervous system ( CNS ), astrocytes and microglia , are key participants in mediating the neurologic dysfunction associated with HIV infection of the CNS .
 microglia, astrocytes, glial 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:
 microglia, astrocytes, glial cells