title: Response to Ptashne.
authors.forename: E
authors.initials: E
authors.lastname: Selsing
mesh_terms: D000818:Animals; D005803:Genes, Immunoglobulin; D007132:Immunoglobulin Isotypes / Q000235:genetics; D007148:Immunoglobulin mu-Chains / Q000235:genetics; D051379:Mice; D008822:Mice, Transgenic / Q000276:immunology*
chemical_list: D007132:Immunoglobulin Isotypes; D007148:Immunoglobulin mu-Chains