Mucopolysarcharidosis type IVB (MPS IVB), also known as Morquio syndrome type B, is a rare, inherited disorder in which genetic variations disrupt the normal activity of lysosomes in human cells.
Mucopolysarcharidosis type VI (MPS VI), also known as Maroteaux-Lamay syndrome, is a rare, inherited disorder in which genetic variations disrupt the normal activity of lysosomes in human cells.
Metachromatic leukodystrophy is a rare genetic condition in which an abnormal accumulation of fat molecules (sulfatides) affects cells in the nervous system.