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The Rex protein of human T-cell leukemia virus type 1 is required for the nuclear export of unspliced viral mRNA and, therefore, for virus replication.
 protein: Rex protein; RNA: unspliced viral mRNA; protein: Rex
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: Rex protein, unspliced viral mRNA, Rex 
Answer:
 protein: Rex protein; RNA: unspliced viral mRNA; protein: Rex