这张照片显示了真核生物细胞外表面四重轴向的电压依赖性钾离子通道。
The image shows a eukaryotic voltage-dependent potassium channel viewed along the four-fold axis from the extracellular surface.
They might ingest extracellular antigen, presented pieces of it on their cell surface in the context of MHC-2.
它们可以吞噬胞外抗原,根据细胞表面的,主要组织相容性抗原-2
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