1840
By using a nucleosome -assembly system derived from Drosophila embryos , we find that the packaging of DNA into chromatin in vitro strongly represses HIV-1 transcription and that repression can be counteracted efficiently by preincubation of the DNA with LEF-1 (or LEF-1 and Ets-1 ) supplemented with fractions containing the promoter-binding protein , Sp1 .
 protein: nucleosome; DNA: chromatin; protein: promoter-binding protein; protein: LEF-1; protein: Sp1; protein: LEF-1; protein: Ets-1
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: nucleosome; DNA: chromatin; protein: promoter-binding protein; protein: LEF-1; protein: Sp1; protein: LEF-1; protein: Ets-1