ARSB (Arylsulfatase B) is an enzyme responsible for breaking down certain glycosaminoglycans, particularly dermatan sulfate. Proper ARSB activity helps prevent the buildup of these molecules in tissues. Deficiency or mutations in ARSB lead to Mucopolysaccharidosis type VI (Maroteaux-Lamy syndrome), a condition marked by skeletal abnormalities, organ involvement, and other systemic effects from dermatan sulfate accumulation.