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EMS analyses performed with nuclear extracts from Tax -expressing Jurkat cells and HTLV-I -transformed peripheral blood mononuclear cells demonstrate that Tax prevents the formation of U1 ( U1A/U1B ) and U2 DNA-protein complexes .
 Tax -expressing Jurkat cells, HTLV-I -transformed peripheral blood mononuclear cells, Tax, DNA-protein complexes, U2, Tax, U1, U1A/U1B
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:
 Tax -expressing Jurkat cells, HTLV-I -transformed peripheral blood mononuclear cells, Tax, DNA-protein complexes, U2, Tax, U1, U1A/U1B