It was reported that GLP-1 has a pivotal effect in the stimulation of neuronal progenitor cells proliferation (During et al. 2003), an effect that is beneficial for the restoration of neuronal networks in different CNS diseases such as Alzheimer’s (Greenberg and Jin 2006; Hansen et al. 2016) and Parkinson’s diseases (Badawi et al. 2017; Safar et al. 2021). The gene discussed is GCG; the disease is Parkinson disease.