Development of lymphoid tissues in the fetal pig.
D000818:Animals; D007108:Immune Tolerance; D008198:Lymph Nodes / Q000196:embryology; D008221:Lymphoid Tissue / Q000196:embryology*; D013154:Spleen / Q000196:embryology; D013552:Swine; D013950:Thymus Gland / Q000196:embryology*