1510
We report the identification of a T cell-specific transcription factor , TCF-1 , binding to this element.
 protein: T cell-specific transcription factor; 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:
 protein: T cell-specific transcription factor; protein: TCF-1