1444
Here, we show by gel retardation analysis that TCF-1 specifically recognizes the T beta 5 element of the TCR beta enhancer and the T delta 7 element of the TCR delta enhancer .
 DNA: TCR beta enhancer; DNA: T delta 7 element; DNA: TCR delta enhancer; DNA: T beta 5 element; protein: TCF-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:
 DNA: TCR beta enhancer; DNA: T delta 7 element; DNA: TCR delta enhancer; DNA: T beta 5 element; protein: TCF-1