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Validation of AuNR uptake into tumor tissue. Representative 20X multiphoton image of tumor tissue 24 hours after tail vein injection of (a) 1X PBS or (b) AuNRs, imaged ex vivo (scale bar = 100 µm). (b) Mean ± standard error of the multiphoton signal across all ex vivo images from mice injected with either PBS (n = 4 images) or AuNRs (n = 8 images). *p < 0.05
