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Tat is an essential regulatory protein for the replication of human immunodeficiency virus ( HIV ).
 protein: regulatory protein; protein: Tat
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: regulatory protein, Tat 
Answer:
 protein: regulatory protein; protein: Tat