9994
Using mouse skin as a test case , we present a novel high - resolution technique to characterize the diffusion properties of heterogeneous biomaterials using 3D imaging of fluorescent probes , precisely - deposited in minimally - perturbed in vivo skin layers .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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