A 32-year-old HIV-positive man presents to dermatology with multiple lesions on his trunk and extremities. On examination, the structure marked **A** (violaceous-brown plaque) is noted along with similar lesions on the hard palate. His CD4 count is 85 cells/μL and he is not on antiretroviral therapy. A skin biopsy with immunohistochemistry is performed. Which of the following viral antigens would be MOST specific for confirming the diagnosis of AIDS-related Kaposi sarcoma in this patient?
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