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A novel Ets-related transcription factor , Elf-1 , binds to human immunodeficiency virus type 2 regulatory elements that are required for inducible trans activation in T cells .
 protein: Elf-1; DNA: human immunodeficiency virus type 2 regulatory elements; cell type: T cells; 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:
 protein: Elf-1; DNA: human immunodeficiency virus type 2 regulatory elements; cell type: T cells; protein: Ets-related transcription factor