mRNA 疫苗细胞内作用机制

一幅教科书风格的扁平示意图，三格面板展示 mRNA 疫苗在人体细胞内触发免疫应答的过程。左格：脂质纳米颗粒（青色半透明球）通过内吞进入细胞；中格：颗粒释放 mRNA（珊瑚红卷曲链），核糖体（深绿色）读取并组装刺突蛋白（紫色皇冠形）；右格：刺突蛋白展示在细胞表面，Y 形抗体（金色）与之结合。三个编号标注圆圈连接各格。浅灰色面板，白色背景，8 pt 无衬线标签。

A textbook flat-illustration panel showing how an mRNA vaccine triggers an immune response inside a human cell. Left panel: a lipid nanoparticle (sphere with a translucent lipid bilayer shell, teal) entering a cell via endocytosis — the membrane shown as a curved arc. Center panel: the nanoparticle releasing a curly mRNA strand (coral-red) into the cytoplasm, ribosome (dark-green blob) reading it and assembling a spike protein (purple crown shape). Right panel: the spike protein displayed on the cell surface, with a Y-shaped antibody (gold) binding to it. Three numbered callout circles (1, 2, 3) connect panels. Background light-grey panels separated by thin dividers. Labels in 8 pt sans-serif: "Lipid nanoparticle", "mRNA release", "Spike protein", "Antibody binding". Minimal color palette — teal, coral, purple, gold on white.