Evidence of differences between Peyer's patches and germinal centers.
D000367:Age Factors; D000818:Animals; D002455:Cell Division; D006410:Hematopoiesis; D007114:Immunization; D010581:Peyer's Patches / Q000166:cytology* / Q000196:embryology / Q000502:physiology; D012756:Sheep / Q000196:embryology / Q000254:growth & development / Q000276:immunology