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. 2020 Sep 16;73(1):73–84. doi: 10.1007/s43440-020-00159-2

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© The Author(s) 2020

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. 4 — Blood serum activity of neutral ceramidase (NC) is a predictor for novel object recognition long-term memory performance in non-human primates (Callithrix penicillata). Data are shown as mean ± SEM. a The subjects (n = 22) were divided in two groups of good and bad learners by median split (50:50%). b Corresponding serum NC activity. c Animals with high serum NC activity showed a better long-term memory performance compared to animals with low NC (*p < 0.05, ***p < 0.001; r Pearson correlation)