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. 2020 Sep 30;12:1759091420962695. doi: 10.1177/1759091420962695

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© The Author(s) 2020

Creative Commons CC BY: This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 6. — Schematic Representation of All the Results Obtained in This Study. It is evident that the SN in SIDS cases is characterized by a decrease in the neuron number and in the expressivity of both the TH enzyme and NM with respect to the control cases and furthermore that these results are closely related to the exposure to cigarette smoke.

SIDS = sudden infant death syndrome; TH = tyrosine hydroxylase; NM = neuromelanin; SNpc = substantia nigra, pars compacta; SNpr = substantia nigra, pars reticulata.