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. 2021 May 17;53(6):917–928. doi: 10.1007/s00726-021-02994-w

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© The Author(s) 2021

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Protein and RNA stability in lyophilized vs. frozen sample pairs of rat kidney and heart tissues. a Alpha smooth muscle actin protein (αSMA) levels, b phosphorylated protein-kinase B (pAkt)/Akt protein ratio, c phosphorylation ratio of endothelial nitric-oxide synthase (eNOS) protein measured from rat kidney and heart samples with Western blot method after 20 months of storage at -80 °C in the case of frozen samples and at 4 °C in the case of lyophilized samples (n = 10 frozen—lyophilized sample pairs; n.s. = not significant). d Relative alpha smooth muscle actin mRNA (Acta2) levels and e absolute Glyceraldehyde 3-phosphate dehydrogenase (Gapdh) mRNA levels measured from rat kidney and heart samples with RT-qPCR method after 20 months of storage at −80 °C in the case of frozen samples and at 4 °C in the case of lyophilized samples (n = 7 frozen—lyophilized sample pairs, n.s. = not significant)