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Transmission electron micrographs showing T. ovis activated oncosphere escaping from the oncospheral membrane (A) and an activated oncosphere with secretory blebs (B). Abbreviations: B, secretory bleb; H, hook; HM, hook muscles; HRM, hook region membrane; Mv, microvilli; OM, oncospheral membrane; PG1, penetration gland cell type 1; PG2, penetration gland cell type 2; SC, somatic cell.
