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Utilizing a IFN-gamma activation site-like DNA sequence element located upstream of the I epsilon exon , we demonstrated by gel mobility shift assays that IL-4 induced a binding activity in the cytosol and nucleus of BL-2 cells .
 DNA: IFN-gamma activation site-like DNA sequence element; DNA: I epsilon exon; protein: IL-4; cell line: BL-2 cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: IFN-gamma activation site-like DNA sequence element, I epsilon exon, IL-4, BL-2 cells 
Answer:
 DNA: IFN-gamma activation site-like DNA sequence element; DNA: I epsilon exon; protein: IL-4; cell line: BL-2 cells