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. 2018 Aug 10;11(8):1402. doi: 10.3390/ma11081402

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© 2018 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 (http://creativecommons.org/licenses/by/4.0/).

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Complex multi-material structures printed. Gel-Alg and P407 bioinks were printed using 25G and 27G tapered nozzles, respectively. (a) general view of a 2-layer porous lattice structures printed with Gel-Alg (left, green for printhead 1 and blue for printhead 2) and P407 (right, green for printhead 3 and red for printhead 4) bioinks; (b) general view of circular lattice structure with the inner circle printed in Gel-Alg (green for printhead 1 and blue for printhead 2), and the outer circle printed in P407 (green for printhead 3 and red for printhead 4); general (c) and side view (d) of an 8-layer porous lattice with alternating layers of Gel-Alg and P407. Sequence of colors: Gel-Alg (orange), Gel-Alg (blue), P407 (green) and P407 (red); scale bars: 2 mm.