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First, from different cell lines three or all four of the nuclear proteins were specifically cross-linked by UV irradiation to the radioactively labeled TRE -DNA fragment .
 DNA: TRE -DNA fragment; protein: nuclear proteins; DNA: TRE
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: TRE -DNA fragment; protein: nuclear proteins; DNA: TRE