Retinoic Acid Receptor Beta (RARB) is a nuclear receptor protein that plays a crucial role in mediating the biological effects of retinoic acid, a derivative of vitamin A. RARB is involved in regulating cell growth, differentiation, and apoptosis, particularly in embryonic development, vision, and immune function. Dysregulation of RARB expression or function has been implicated in various pathological conditions, including several types of cancer, neurodevelopmental disorders, and inflammatory diseases. It acts as a ligand-activated transcription factor, binding to specific DNA sequences to modulate gene expression.