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Expression of the HI - viral structure proteins is driven by a natural 5 ' LTR promoter and a 3 ' polyadenylation signal , whereas the envelope expression out of the shuttle vector is achieved by an IRES .
 Anatomy: LTR; Anatomy: envelope
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: LTR; Anatomy: envelope