title: A cautionary note concerning the possibility that transforming growth factor-beta is a switch factor that acts on primary B cells to initiate IgA expression.
authors.affiliation: Department of Biology, University of Pennsylvania, Philadelphia.
authors.forename: J J
authors.initials: JJ
authors.lastname: Cebra
authors.forename: A
authors.initials: A
authors.lastname: George
authors.forename: R L
authors.initials: RL
authors.lastname: Kerlin
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D007070:Immunoglobulin A / Q000096:biosynthesis* / Q000235:genetics; D007134:Immunoglobulin Switch Region / Q000187:drug effects; D008070:Lipopolysaccharides / Q000276:immunology; D016212:Transforming Growth Factor beta / Q000276:immunology* / Q000494:pharmacology
chemical_list: D007070:Immunoglobulin A; D008070:Lipopolysaccharides; D016212:Transforming Growth Factor beta