OXT and Parkinson disease: In the PVN region, including PaAP, PaMM, PaV, PaLM, PaDC, PaMP, and PaPo subregions, the total number of oxytocin‐positive neurons was decreased in the MPTP group (Figure 1J,K), which is consistent with that observed in PD patients.[16] With the Oxt‐Cre; Ai14 transgenic mice to label oxytocin neurons, we recorded the activity of PVN oxytocin neurons in saline (Con) and MPTP‐treated groups (Figure 1L).