DO_rare_slim galactosemia 4 disease_ontology ORDO:570422 DOID:0060969 A galactosemia characterized by persistent congenital galactosemia due to deficiency of the enzyme galactose mutarotase that has_material_basis_in homozygous or compound heterozygous mutation in the GALM gene on chromosome 2p22. GALM deficiency Galactose mutarotase deficiency MIM:618881 Galactosemia type 4 galactosemia