GDNF and Parkinson disease: Furthermore, in a study in which glial-derived neurotrophic factor was infused directly into the putamen of people with PD, mild dyskinesias were described when participants were under stress in the ‘off’ motor assessments, which resolved at later time points as PD symptoms also started to reappear (https://sciencehub.novonordisk.com/congresses/ean2022/advancing-the-treatment-landscape-in-parkinson-s-disease.html).