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However, in vitro mutagenesis of the HTLV-I rex gene has provided indirect evidence which suggests that p21rex , and by analogy HTLV-II p24rex , results from initiation at an internal AUG of the tax /rex mRNA .
 protein: p24rex; DNA: tax; DNA: rex gene; RNA: tax /rex mRNA; DNA: rex; DNA: /rex; protein: p21rex
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: p24rex; DNA: tax; DNA: rex gene; RNA: tax /rex mRNA; DNA: rex; DNA: /rex; protein: p21rex