结论 有毒株钩体对内皮细胞单层的穿透能力明显强于减毒株和腐生型钩体；
Conclusion The invasive ability of virulent leptospires is much stronger than both attenuated and saprophytic leptospires.
结果： 肉瘤细胞可以穿过血管内皮细胞游走至血管外；肉瘤细胞向血管外的游走能够引起单层血管内皮细胞的电阻下降；
RESULTS: Sarcoma cells migrated through endothelial cells into collagen gel, the electrical resistance of a HUVEC monolayer reduced in extravasation migration of sarcoma cells.
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