TNFAIP3 (TNF Alpha Induced Protein 3): TNFAIP3, also known as A20, is a key negative regulator of NF-κB signaling, helping control inflammation and immune responses. It functions by ubiquitinating signaling molecules to halt NF-κB activation, preventing prolonged inflammation that could lead to autoimmune diseases. Mutations or dysregulation of TNFAIP3 are associated with various autoimmune and inflammatory conditions, making it a significant target of therapeutic research.