Before a helper t cell can trigger a response to a pathogen or parasite, it has to "feel" these molecular bits of an invader displayed on the surface of an antigen-presenting cell (APC).
在辅助T细胞激发针对病原的免疫反应之前，它必须感觉到位于抗原递呈细胞面表的入侵者分子片段。
These results demonstrate the utility of the gene targeting approach in the study to investigate the gene function of T. gondii. and the mechanism by which this parasite invades to the host cells.
结论 通过构建基因打靶载体 ，可有目的地敲除弓形虫膜抗原基因 ，为进一步研究弓形虫侵入机制 ，探讨弓形虫病防治提供可行的方法。
CD8+ cytotoxic T lymphocytes (CTL) play a critical role in eradicating Plasmodium falciparum at the pre-erythrocyte stage of the parasite infection.
杀伤性T淋巴细胞（CTL）是红细胞前期恶性疟原虫免疫防护的关键环节。
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