Nuclear structure in lymphoid primordia.
D000818:Animals; D002060:Bursa of Fabricius / Q000196:embryology*; D002642:Chick Embryo; D004475:Ectoderm / Q000196:embryology*; D004707:Endoderm / Q000196:embryology*; D008221:Lymphoid Tissue / Q000196:embryology*; D013950:Thymus Gland / Q000196:embryology*