Classification This syndrome has two forms, A and B, referred to as<unk>  A and<unk>  B syndrome or MPS IVA and MPS IVB. The two forms are distinguished by the gene product involved; Type A involves a malfunction in the GALNS gene, while Type B involves a malfunction of the GLB1 gene. + Genetics of MPS IV<unk>  type Gene Missing enzyme Chromosomal region Type A GALNS Galactosamine-6 sulfatase 16q24 Type B GLB1 Beta-galactosidase 3p22
Morquio syndrome
Eiken syndrome
Hapnes Boman Skeie syndrome
Zieve's syndrome
Galloway Mowat syndrome
Schimmelpenning syndrome
Okamoto syndrome
Sanjad-Sakati syndrome