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Immunogold localization of the p200 antigen in B. bigemina merozoites by electron microscopy. The electron micrograph shows a longitudinal section through a merozoite in the erythrocyte cytoplasm. The spheroid body (S), rhoptries (R), and nucleus (N) of the merozoite are indicated. MAb Bb F4/86.11 immunogold labeling was mainly located in the merozoite cytoplasm, although some was also present in the spheroid body. Bar = 0.5 μm.
