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TR alpha 1 and TR beta 2 each formed a single major TR : TREp complex which comigrated with the least retarded complex formed by GH3 NE , while TR beta 1 formed multiple complexes suggesting that it can bind to TREp as an oligomer .
 protein: oligomer; protein: TR alpha 1; DNA: TREp; protein: TR; protein: TR beta 1; DNA: TREp; protein: TR : TREp complex; protein: TR beta 2
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: oligomer; protein: TR alpha 1; DNA: TREp; protein: TR; protein: TR beta 1; DNA: TREp; protein: TR : TREp complex; protein: TR beta 2