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Whole-body fluorescence images of mice i.v. injected with NPs. (a) GS-AgNPs showed more effective targeting to SSG (marked by a white circle) than GS-AuNPs (b). (c) The time fluorescence intensity curves of the submandibular salivary glands were obtained through quantitative analysis of whole-body fluorescence images. (d) High accumulation of GS-AgNPs in SSG was further confirmed by invasive and bright field imaging.
