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Our results indicate that gp120 enhances ICAM-1 gene expression in primary rat astrocytes , primary human astrocytes , a human astroglioma cell line CRT , and primary rat microglia .
 human astroglioma cell line CRT, astrocytes, primary rat microglia, gp120, primary rat astrocytes, astrocytes, microglia, primary human astrocytes, ICAM-1
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:
 human astroglioma cell line CRT, astrocytes, primary rat microglia, gp120, primary rat astrocytes, astrocytes, microglia, primary human astrocytes, ICAM-1