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Rex acts posttranscriptionally to facilitate accumulation of full-length gag/pol and singly spliced env mRNA in the cytoplasm of HTLV-infected cells .
 protein: Rex; cell type: HTLV-infected cells; protein: gag/pol; RNA: env 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: Rex; cell type: HTLV-infected cells; protein: gag/pol; RNA: env mRNA