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In this manuscript, we demonstrate that Rex shuttles between the nucleus and the cytoplasm and that its activation domain constitutes a nuclear export signal that specifies efficient transport to the cytoplasm .
 protein: activation domain; protein: Rex; protein: nuclear export signal
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: activation domain, Rex, nuclear export signal 
Answer:
 protein: activation domain; protein: Rex; protein: nuclear export signal