title: Letters: A simple sphingomyelinase determination for Niemann-Pick disease: differential diagnosis of types A, B and C.
mesh_terms: D000653:Amniotic Fluid / Q000201:enzymology; D001706:Biopsy; D001921:Brain / Q000201:enzymology; D002855:Chromatography, Thin Layer; D004796:Clinical Enzyme Tests; D003937:Diagnosis, Differential; D005260:Female; D005347:Fibroblasts / Q000201:enzymology; D006801:Humans; D007525:Isoelectric Focusing; D007700:Kinetics; D007962:Leukocytes / Q000201:enzymology; D008722:Methods; D009542:Niemann-Pick Diseases / Q000175:diagnosis / Q000201:enzymology*; D010727:Phosphoric Diester Hydrolases / Q000032:analysis* / Q000652:urine; D011247:Pregnancy; D012007:Rectum / Q000201:enzymology; D013109:Sphingomyelins; D014316:Tritium
chemical_list: D013109:Sphingomyelins; D014316:Tritium; D010727:Phosphoric Diester Hydrolases