TNXB (Tenascin-XB) is a member of the tenascin family of extracellular matrix proteins and plays a key role in tissue development, organization, and maintenance. It is primarily found in connective tissues, contributing to the structural integrity and elasticity of the extracellular matrix (ECM). TNXB supports cell adhesion, migration, and proliferation, influencing processes such as wound healing, tissue remodeling, and organ formation. Its expression is especially high in skin, tendons, and blood vessels, where it helps regulate the mechanical strength and resilience of these tissues.