PP1 is a selective inhibitor of Src-family kinases and other specific protein kinases, widely used in biological and medical research. It is particularly valuable in studying cellular signaling pathways, as it helps researchers understand the role of kinases in processes like cell growth, division, and communication. In cancer research, PP1 is utilized to investigate the mechanisms of tumor development and to explore potential therapeutic targets. Additionally, it aids in the study of neurological disorders by examining kinase involvement in brain function and disease. Its application extends to drug development, where it serves as a tool for screening and designing kinase inhibitors.