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Peyer's Patches
Ileum
T-Lymphocytes
Lymphoid Tissue
Jejunum
Fetuses
Germinal Center
Adenoids
Bursa of Fabricius
Thoracic Duct
Cattle
Chickens
Newborn Animals
Immunoglobulin G
RNA, Messenger
Immunoglobulin A
Base Sequence
Gene Expression
Immunohistochemistry
Fetal Development
Co-Publications
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