ARSB and mucopolysaccharidosis: One IDUA variant, three IDS variants, three GALNS variants, and three ARSB variants were classified as benign (likely benign), of which one IDUA variant, three IDS variants, one GALNS variant, and three ARSB variants were from infants identified through NBS for MPS (Table 1, Table 2, Table 3 and Table 4).