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However, transcription from crippled HIV-1 LTRs lacking C/EBP sites can still be induced following activation of U937 cells .
 DNA: LTRs; DNA: C/EBP sites; cell line: U937 cells; DNA: crippled HIV-1 LTRs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 DNA: LTRs; DNA: C/EBP sites; cell line: U937 cells; DNA: crippled HIV-1 LTRs