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. 2016 Jan 27;6:19370. doi: 10.1038/srep19370

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(a) Extracted radiant fluorescence intensity (dots) versus time for five various locations at r = 2.475, 4.243, 6.790, 8.770, and 11.170 mm. (b) The calculated results on the transient distribution of apparent fluorophore concentration at the corresponding locations. The diffusivity D is approximately 4.32 mm²/day.