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Reactivity of horse sera on HFV antigens tested by immunoprecipitation on protein extracts from HFV-infected U373-MG cells. The pattern obtained for one positive and one negative horse antiserum is shown in parallel with one characteristic profile visualized with anti-HFV antibodies. The 130-kDa Env precursor, the 160-kDa Env-Bet HFV glycoprotein, and the Bet protein are indicated.
