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. 2019 Feb 12;10:100. doi: 10.3389/fneur.2019.00100

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Copyright © 2019 Jin, Wang, Wang, Lian, Zhou, Zhang, Lv, Li, Huang, Cheng, Fei, Liu, Zeng and Zhong.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Visual scores (3-point ordinal scale) for patients with PD, patients with ET, and controls. (A) Visual scores for neuromelanin. (B) Visual scores for nigrosome-1. Note that no definitely abnormal neuromelanin signals (score: 2) were observed in the ET and control groups, and the frequency of nigrosome-1 absence (score: 2) was significantly lower in the ET group than in the PD group (p < 0.001).