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Human T leukemia virus type 1 ( HTLV-1 ) infects T cells and can lead to increase GM-CSF expression .
 T cells, GM-CSF
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:
 T cells, GM-CSF