mRNA 疫苗细胞作用机制

一张教科书风格的等距信息图，展示 mRNA 疫苗在人体细胞内的分步作用。背景米白，脂质纳米颗粒（LNP）为珊瑚粉，核糖体为青绿色，刺突蛋白为金色。从 LNP 进入细胞膜，到 mRNA 释放、核糖体翻译刺突蛋白，再到靛蓝 Y 形抗体结合刺突蛋白，共五步，珊瑚色圆形数字徽章标注步骤，细箭头连接，无阴影扁平风格，适合 Science 杂志图表。

A textbook-flat isometric infographic showing the step-by-step action of an mRNA vaccine inside a human cell. The scene is rendered in a soft clinical palette: off-white background, coral-pink for the lipid nanoparticle, teal for the ribosome, gold for the spike-protein antigen. Step 1 at top-left: a lipid nanoparticle labelled "LNP" floating in pale blue extracellular space. Step 2: the nanoparticle merging with a cell membrane drawn as a crisp lipid-bilayer cross-section. Step 3: mRNA strand (depicted as a wavy orange ribbon) escaping into the cytoplasm. Step 4: the mRNA docking on a teal ribosome, and a spike-protein shape being assembled above it. Step 5: the spike protein presented on the cell surface; a Y-shaped antibody (indigo) binding to it. Numbered step badges in coral circles. Thin black connector arrows. All labels in clean 10 pt sans-serif. Style: Science magazine graphic, flat shadow-free, readable at 1200 × 900 px.