MAOB and Parkinson disease: The drug-receptor occupancy (RO%) is calculated using the below formula, and Figure 6 illustrates PET images of the human brain in Parkinson's Disease (PD) condition with baseline and after treatment with a blocking agent study, these studies were performed to measure the brain Monoamine Oxidase B (MAO-B) receptor occupancy by Rasagiline (selective MAO-B inhibitor) using the selective radiotracer 11C-L-Deprenyl, and also showed treatment response in PD condition with selective drug Rasagiline (42).