1637
Although specific binding sites have been difficult to localize by chemical or enzymatic footprinting procedures , NF-muNR binding sites are critical for efficient MAR-BP1 binding .
 protein: NF-muNR; protein: MAR-BP1
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: NF-muNR; protein: MAR-BP1