title: Significant differences in natural killer cell activity in children according to age and sex.
mesh_terms: D000328:Adult; D000367:Age Factors; D002460:Cell Line; D002648:Child; D002675:Child, Preschool; D003602:Cytotoxicity, Immunologic; D005260:Female; D006801:Humans; D007223:Infant; D007694:Killer Cells, Natural / Q000276:immunology*; D007951:Leukemia, Myeloid; D008137:Longitudinal Studies; D008297:Male; D012737:Sex Factors