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Depth penetration experiment for evaluating the impact of light absorption by biological tissues. (A) NIR-Ia and (B) NIR-Ib fluorescence spectra of the dye-filled capillary tube at varying depths inside a leaf homogenate-filled cuvette. (C) NIR-Ia and (D) NIR-Ib fluorescence spectra of a 4 × 4 mm cuvette filled with various concentrations of IR-808 solution inside a leaf-wrapped cuvette.
