title: Ontogeny of the immune response in animals having less than one million lymphocytes: the larvae of the toad Alytes obstetricans.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000921:Antibody-Producing Cells; D001001:Anura / Q000276:immunology*; D002452:Cell Count; D004912:Erythrocytes / Q000276:immunology; D006462:Hemolytic Plaque Technique; D008214:Lymphocytes / Q000276:immunology*; D012756:Sheep; D013154:Spleen / Q000166:cytology / Q000254:growth & development / Q000276:immunology*