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. 2020 Nov 23;20:357. doi: 10.1186/s12906-020-03138-5

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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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Proliferative effects of royal jelly extracts on keratinocytes (HaCaT) after incubation for 48 h. Effects of hydrophilic and lipophilic fractions from Castanea mollissima Bl. a-b and Brassica napus L. c-d royal jelly on the growth of HaCaT cells. Results are expressed as the mean ± SEM. Statistical significance of differences: **, p < 0.01; ***, p < 0.001; #, p < 0.05; ##, p < 0.01 (* and # represent proliferative and cytotoxic effects compared with control conditions, respectively)