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The microneedle patch reported by Samant et al. utilized absorbent microneedles to sample interstitial fluid from animal models. a Schematic of the microneedle patch. b The bottom view of the device, showing the absorbent paper was sandwiched by stainless steel covers. c Extraction of interstitial fluid from rat skin in vivo. Reproduced from Samant and Prausnitz 2018 with permission from the Royal Society of Chemistry
