Monarch Disease Ontology entry MONDO_0009660 (mucopolysaccharidosis type 4B) is a rare autosomal recessive lysosomal storage disease caused by deficiency of the enzyme beta galactosidase. It is characterized by skeletal dysplasia and short stature. Also known as: Beta-D-galactosidase deficiency, MPS 4B, MPS IV B, MPS4B, MPSIVB, Morquio disease type B, Morquio syndrome B, mucopolysaccharidosis type IVB.