title: HBAg in spinal fluid in leukaemia.
mesh_terms: D001812:Blood-Brain Barrier; D002648:Child; D006511:Hepatitis B Antigens / Q000134:cerebrospinal fluid*; D006801:Humans; D007938:Leukemia / Q000134:cerebrospinal fluid*
chemical_list: D006511:Hepatitis B Antigens