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Ultrastructural immunolocalization of To16, To18, and To45W in the secretory blebs of T. ovis activated oncospheres. (A to C) Sections probed with control antisera raised against MBP. (D to F) Sections probed with specific antisera raised against To16, To18, and To45W, respectively. In all cases, immunogold particles (arrows) are distributed in the granular contents of the secretory blebs.
