title: Letter: HB5Ag in spinal fluid from leukaemic children.
mesh_terms: D001812:Blood-Brain Barrier; D002555:Cerebrospinal Fluid / Q000276:immunology*; D002648:Child; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D007122:Immunoelectrophoresis; D007938:Leukemia / Q000097:blood / Q000134:cerebrospinal fluid / Q000276:immunology*; D009500:Neutralization Tests; D011863:Radioimmunoassay
chemical_list: D006511:Hepatitis B Antigens