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TEM images of a Comirnaty sample stored for 7 days in the refrigerator, diluted in water, and stained with acidic uranyl acetate as described in the Methods. Blue arrows in (A) point at the fusion of nanoparticles. (B) Higher magnification image of some LNPs. (C) Zoom-in of one of the elongated helical-like structures indicated by red arrows in (A).
