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Immunoprecipitation of antigens from the surfaces of B. bigemina-infected erythrocytes. Biotin-labeled surface proteins from infected erythrocytes were immunoprecipitated with MAb 64/32 (lane 2, arrow) or the negative control MAb 64/11 (lane 4). Surface-labeled uninfected erythrocytes were immunoprecipitated with either MAb 64/32 (lane 1) or MAb 64/11 (lane 3). Molecular size standards are designated on the left.
