450
The trans-activation domain of E2 and Tax is interchangeable although they have no obvious sequence homology between them.
 protein: E2; protein: Tax
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: E2; protein: Tax