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In this report, we demonstrate that a novel Ets-related transcription factor , Elf-1 , binds specifically to two purine-rich motifs in the HIV-2 enhancer .
 DNA: HIV-2 enhancer; DNA: two purine-rich motifs; protein: Elf-1; protein: Ets-related transcription factor
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: HIV-2 enhancer; DNA: two purine-rich motifs; protein: Elf-1; protein: Ets-related transcription factor