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By using an infectious molecular clone of HTLV-II , we investigated the importance of the internal ATGs of the rex gene on Rex protein production and function.
 DNA: rex; protein: Rex; DNA: rex gene
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: rex; protein: Rex; DNA: rex gene