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. 2021 Sep 8;13:689939. doi: 10.3389/fnagi.2021.689939

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Copyright © 2021 Hu, Huang, Ma, Li, Zhao, Zheng, Li, Wang, Sun and Shi.

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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Distribution of serum levels of pituitary adenylate-cyclase activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) by Hoehn–Yahr (H-Y) stage. (A) There were no significant differences in the distribution of serum PACAP levels by H-Y stage in Parkinson’s disease (PD) patients (P > 0.05). (B) There were no significant differences in the distribution of serum VIP levels by H-Y stage in PD patients (P > 0.05).