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. 2021 Jul 23;26(15):4451. doi: 10.3390/molecules26154451

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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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Optical image of 3D rGO/PPY/Sr scaffolds were immersed in 5 mL of PBS (the first row). Release of the Sr ions from the 3D rGO/PPY/Sr (the second row) scaffolds.