3. Lig is a term that refers to a specific type of protein structure found in biological systems. It plays a crucial role in various cellular processes, including signaling and structural support. The term is often used in the context of molecular biology and biochemistry. In the context of ligand binding, 3. Lig can refer to the interaction between a ligand and a receptor, which is essential for many physiological functions. Understanding this interaction helps researchers develop drugs and therapies that target specific pathways in the body.