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. 2019 Dec 4;9:18345. doi: 10.1038/s41598-019-54789-5

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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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Vitreal levels of levodopa and its metabolites in form deprived (FD) and levodopa treated chicks. (A) Levodopa (B) dopamine (C) 3,4-dihydroxyphenylacetic acid (DOPAC). Data represents the mean ± standard error of the mean. Statistics denote difference to FD Only; *p < 0.05, **p < 0.02, ***p < 0.001. TRACE denotes when several samples were detected (S/N > 3) but not quantifiable (S/N < 10); levodopa in FD samples fell in this range in 4 out of 5 samples and dopamine in FD samples fell in this range in 2 out of 5 samples.