Tryptase beta-2 (TPSB2), also known as TPS2, is a member of the peptidase S1 family and the mast cell-specific tryptase subfamily. It is a serine protease primarily expressed in mast cells and basophils. TPSB2 is synthesized as a proenzyme, stored in secretory granules, and released upon cell activation. It plays a crucial role in allergic reactions and inflammation by cleaving extracellular matrix proteins, activating protease-activated receptors (PARs), and processing cytokines like IL-33. Elevated levels of TPSB2 are associated with conditions such as asthma, allergic rhinitis, and anaphylaxis, making it a biomarker and therapeutic target in these areas.