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In vivo biodistribution of 50 µg/100 µL AuNPs 8 in a A431-tumorbearing mouse: (a) fluorescence before injection, (b) 4 h p.i., (c) 21 h p.i., (d) 28 h p.i., (e) 48 h p.i., and (f) 72 h p.i. Ratio tumor:muscle:liver:kidney/g = 4.4:1.0:0.6:5.4 (e).
