title: The old and the restless.
authors.affiliation: Department of Immunology, University of Toronto, Ontario M5G 2M9, Canada. susanna@sickkids.on.ca
authors.forename: S M
authors.initials: SM
authors.lastname: Lewis
authors.forename: G E
authors.initials: GE
authors.lastname: Wu
mesh_terms: D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000235:genetics; D019143:Evolution, Molecular; D005803:Genes, Immunoglobulin; D016654:Genes, RAG-1; D019672:Genes, T-Cell Receptor; D006801:Humans; D011995:Recombination, Genetic
chemical_list: D004247:DNA