title: Reply to M. F. Greaves. Majority of cases of childhood ALL arise by spontaneous mutations in lymphoid progenitor cells.
authors.affiliation: Department of Hematology/Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee.
authors.forename: S B
authors.initials: SB
authors.lastname: Murphy
mesh_terms: D001402:B-Lymphocytes / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D006412:Hematopoietic Stem Cells / Q000473:pathology; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics* / Q000276:immunology; D008954:Models, Biological; D009154:Mutation; D013601:T-Lymphocytes / Q000473:pathology