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. 2015 Mar 13;5:9071. doi: 10.1038/srep09071

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(a) Imaging sites where S1: Base of little finger; S2: Between thumb and wrist; S3: Index finger tip; S4: Inner arch; S5: Mound of big toe; S6: Right second toe (b) Typical optical coherence tomography (OCT) image in the x-z plane showing the stratum corneum, sweat duct and dermis (c) A 2.5 × 2.5-mm en face OCT image in the x-y plane showing the sweat gland duct distribution. Here, the light white spots are the sweat ducts and the light gray features are due to the undulations of the skin surface (fingerprints).