1545
In contrast, formation of the B1 complex , reflecting the binding of p75 and p85 , critically depends upon the more 3' sequences of this enhancer element .
 protein: B1 complex; DNA: enhancer element; protein: p75; protein: p85
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: B1 complex; DNA: enhancer element; protein: p75; protein: p85