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Scanning electron microscopy assay. The T. gondii were treated with 17 μg/ml Ov EO (A), 17 μg/ml Ca (B), DMSO (C) or untreated (D). After treated by Ov EO, the tachyzoites became sunken compared with those untreated tachyzoites. Tachyzoites treated with Ca become curled up. Scale bars: 1 μm.
