DOK5 (Docking Protein 5) is a member of the DOK family of adaptor proteins, which serve as substrates for receptor tyrosine kinases and facilitate intracellular signal transmission. It plays a key role in pathways that regulate cell growth, differentiation, and survival. DOK5 is especially involved in neuronal development and has been associated with insulin signalling, making it important for both nervous system formation and metabolic regulation.