它们位于血管网周围，可以起到抗原递呈细胞的作用。抗原递呈细胞启动针对抗原的免疫反应并释放入血。
They are found in a perivascular network and may serve as the antigen presenting cell which initiates immune responses to antigens delivered through the circulation.
我们知道，人体对外来抗原的免疫应答依赖t细胞和特异性抗原递呈细胞(APC)之间协调的相互作用。
It is generally accepted that normal immune response to extrinsic antigens depends on coordinating interaction between t cells and antigen presenting cells (APCs).
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。
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).
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