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. 2021 Oct 15;53(11):1695–1703. doi: 10.1007/s00726-021-03079-4

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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. 3 — Photon images of rat livers based on polyamine intake (n = 6 each). a After 4 weeks of oral intake, the rats’ whole livers were removed using by IVIS. b Photon intensity values are shown for rats consuming 0%, 0.01%, and 0.1% of polyamine in food. Photon levels of rats consuming foods with 0% and 0.01% of polyamine were significantly lower than those of rats consuming 0.1% of polyamine in food (P < 0.01). c The polyamine concentrations of rat livers were examined in each experimental group using high-pressure liquid chromatography. The black bar indicates 0% of polyamine in food, the gray bar indicates 0.01% of polyamine, and the white bar indicates 0.1% of polyamine (P < 0.01)