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. 2021 Aug 31;12(9):1057. doi: 10.3390/mi12091057

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Transfer printing fabrication of Gln hydrogel MEA. (a,b) Schematic representation illustrating the mechanisms that enable one-step transfer printing microelectrode patterns of NP-doped GelMA to Gln-mTG hydrogels. (c) Representative force–distance curves obtained by retracting the indenter from the surface of Gln and Gln-mTG. (d) The naked views of the as-fabricated adhesive hydrogel MEA, which entangles around a wire with 3 mm in diameter. Optical images showing the enlarged views of NP-doped GelMA microelectrodes patterning on the Gln-mTG. (e) Scanning electron microscopic images of the hydrogel MEA showing continuous interfaces in the bonding area.