748
Rex , the post-transcriptional regulator of human T-cell leukemia virus type I ( HTLV-I ), is known to induce accumulation of the unspliced viral gag-pol mRNA .
 protein: post-transcriptional regulator; protein: Rex; RNA: unspliced viral gag-pol mRNA
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: post-transcriptional regulator; protein: Rex; RNA: unspliced viral gag-pol mRNA