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SIVcpz-specific antibodies in chimpanzee plasma. A plasma sample from chimpanzee CAM13 was tested for HIV-1 cross-reactive antibodies by commercial (HIV-1 antigen-based) Western immunoblotting. Molecular weights of HIV-1-specific proteins are indicated. The banding patterns of plasma samples from HIV-1-infected and noninfected humans are shown for positive and negative controls, respectively.
