1493
To dissect the molecular basis for the unusual persistent expression of the IL-2 and IL-2-R alpha genes in these IARC 301 T cells , we have analyzed the interactions of constitutively expressed nuclear proteins with the 5' flanking regions of the IL-2 and IL-2-R alpha genes using both DNase I footprinting and gel retardation techniques.
 DNA: 5' flanking regions; protein: DNase I; cell type: T cells; protein: constitutively expressed nuclear proteins; cell line: IARC 301
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:
 DNA: 5' flanking regions; protein: DNase I; cell type: T cells; protein: constitutively expressed nuclear proteins; cell line: IARC 301