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Binding of the 65-kDa plus 50-kDa heterodimer to the HIV-1 enhancer can be negatively regulated in monocytes , providing one mechanism restricting HIV-1 gene expression .
 cell type: monocytes; protein: 50-kDa heterodimer; DNA: HIV-1 gene; protein: 65-kDa; DNA: HIV-1 enhancer
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:
 cell type: monocytes; protein: 50-kDa heterodimer; DNA: HIV-1 gene; protein: 65-kDa; DNA: HIV-1 enhancer