1287
The transcription factor HIV-TF1 , which binds to a region about 60 bp upstream from the enhancer of the human immunodeficiency virus-1 ( HIV-1 ), was purified from human B cells .
 protein: HIV-TF1; DNA: 60 bp upstream; protein: transcription factor; cell type: human B cells
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:
 protein: HIV-TF1; DNA: 60 bp upstream; protein: transcription factor; cell type: human B cells