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. 2019 Dec 13;9:19019. doi: 10.1038/s41598-019-55288-3

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Mean relative MTT activity and standard deviation in 3T3 cell cultures and HDPC cultures after a 24-h exposure to 1-d (a,b) and 28-d eluates (c,d) of commercial and prototype materials and their dilutions. Results are expressed as percentages in regards to the MTT activity of the HBSS group. The statistical differences between non-diluted leachates are indicated with different letters in each group (p < 0.050).