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. 2019 Dec 16;22(1):8. doi: 10.1007/s10544-019-0456-z

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© The Author(s) 2020

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Fig. 6 — Skin penetration tests. a Methylene blue stained marks after the skin test. b Optical coherence tomography of one MN (SC – stratum corneum, MN – microneedle, GS – glass substrate, E – epidermis)