JNJ303 is primarily utilized in the field of medical research, particularly in the study of neurological disorders. It functions as a selective inhibitor targeting specific pathways involved in neurodegeneration, making it a valuable tool for understanding and potentially treating conditions like Alzheimer's disease. Researchers employ JNJ303 to investigate its effects on protein aggregation and neuronal survival, aiming to develop therapies that can slow or halt disease progression. Additionally, its application extends to preclinical studies, where it is used to evaluate efficacy and safety in animal models, providing insights into its potential for future clinical use.