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The human immunodeficiency virus ( HIV ) Rev protein is essential for viral structural protein expression ( Gag , Pol , and Env ) and, hence, for viral replication .
 protein: Env; protein: Rev protein; protein: Pol; protein: Gag
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: Env; protein: Rev protein; protein: Pol; protein: Gag