219072
The Human immunodeficiency virus 1 ( HIV-1 ) Vpu protein acts in the degradation of CD4 in the endoplasmic reticulum and in the enhancement of virion release from the plasma membrane of infected cell s. It is found in the membranes of infected cells , but not the virus particles themselves .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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