1-Naphthyl PP1 is primarily utilized in biochemical research as a potent and selective inhibitor of Src family kinases. It is commonly employed in studies to understand the role of these kinases in cellular signaling pathways, particularly in processes like cell proliferation, differentiation, and survival. Researchers use it to investigate the effects of kinase inhibition in various experimental models, including cancer research, where Src family kinases are often implicated in tumor growth and metastasis. Additionally, it serves as a valuable tool in pharmacological studies to explore potential therapeutic targets for diseases involving aberrant kinase activity. Its specificity makes it a preferred choice for dissecting complex signaling networks in vitro.