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In this paper we demonstrate that the distal region of the human immunodeficiency virus-1 ( HIV-1 ) enhancer , which contains DNA-binding sites for LEF-1 and Ets-1, also provides a functional context for activation by LEF-1 .
 protein: LEF-1; DNA: human immunodeficiency virus-1 ( HIV-1 ) enhancer; protein: LEF-1; DNA: DNA-binding sites
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: LEF-1; DNA: human immunodeficiency virus-1 ( HIV-1 ) enhancer; protein: LEF-1; DNA: DNA-binding sites