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LDI-MS images of AuNPs in mouse spleens. The biodistributions of AuNPs are shown in panel a (AuNP 1), b (AuNP 2), and c (AuNP 3). Ions selected for image generation: AuNP 1 m/z 436, AuNP 2 m/z 492, and AuNP 3 m/z 548. Scale bar represents 500 μm.
