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Sentinel lymph node (SLN) imaging of a nude mouse with PS-PEG@TB NPs intradermally injected into the forepaw pad at various times post-injection. (A) Fluorescence imaging (excitation light: 570 nm) of the mouse 15, 40, 60 and 90 min after injection. (B) The fluorescence intensity at different wavelengths with signal and background. (C) The fluorescence intensity of SLNs at different times post-injection.
