title: Evidence for the existence of two distinct types of Peyer's patches in sheep.
mesh_terms: D000367:Age Factors; D000818:Animals; D002465:Cell Movement; D007082:Ileum / Q000033:anatomy & histology; D007583:Jejunum / Q000033:anatomy & histology; D008214:Lymphocytes / Q000166:cytology*; D010581:Peyer's Patches / Q000166:cytology* / Q000196:embryology; D012756:Sheep / Q000033:anatomy & histology / Q000254:growth & development / Q000276:immunology*