ARSB and mucopolysaccharidosis type 6: Mucopolysaccharidosis type VI (MPS VI; Maroteaux-Lamy syndrome; MIM ID #253200) is an autosomal recessive lysosomal storage disorder, caused by mutations in the gene encoding arylsulfatase B (ARSB; N-acetylgalactosamine 4-sulfatase) [1].