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HIV (Human Immunodeficiency Virus) is a retrovirus belonging to the family Retroviridae and the genus Lentivirus. It is the causative agent of AIDS (Acquired Immunodeficiency Syndrome), a condition characterized by progressive failure of the immune system. HIV is an enveloped virus with a spherical structure and contains two identical single-stranded RNA molecules as its genetic material. The viral envelope bears glycoproteins gp120 and gp41, which play ____ _____ _________ __________ ___ _________ ________.
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