1264
Isolation of a candidate repressor/activator , NF-E1 ( YY-1 , delta ), that binds to the immunoglobulin kappa 3' enhancer and the immunoglobulin heavy-chain mu E1 site .
 protein: NF-E1; DNA: immunoglobulin heavy-chain mu E1 site; DNA: immunoglobulin kappa 3' enhancer; protein: delta; protein: YY-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: NF-E1; DNA: immunoglobulin heavy-chain mu E1 site; DNA: immunoglobulin kappa 3' enhancer; protein: delta; protein: YY-1