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However, Nef does not affect the DNA-binding activity of other transcription factors implicated in HIV-1 regulation , including SP-1 , USF , URS , and NF-AT .
 protein: SP-1; protein: Nef; protein: URS; protein: transcription factors; protein: NF-AT; protein: USF
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: SP-1; protein: Nef; protein: URS; protein: transcription factors; protein: NF-AT; protein: USF