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We have examined the binding of nuclear proteins and recombinant thyroid hormone receptors ( TRs ) to the palindromic thyroid hormone responsive element AGGTCATGACCT ( TREp ) using a gel electrophoretic mobility shift assay .
 protein: TRs; DNA: TREp; protein: recombinant thyroid hormone receptors; DNA: palindromic thyroid hormone responsive element; protein: nuclear proteins
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: TRs; DNA: TREp; protein: recombinant thyroid hormone receptors; DNA: palindromic thyroid hormone responsive element; protein: nuclear proteins