title: Is the yolk sac the primary origin of lymphoid stem cells?
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000502:physiology; D002060:Bursa of Fabricius / Q000502:physiology; D002454:Cell Differentiation; D002642:Chick Embryo; D002645:Chickens; D002678:Chimera; D006410:Hematopoiesis; D007126:Immunoglobulin Allotypes; D008214:Lymphocytes / Q000502:physiology*; D012730:Sex Chromosomes; D013154:Spleen / Q000502:physiology; D013950:Thymus Gland / Q000502:physiology; D015017:Yolk Sac / Q000276:immunology* / Q000502:physiology
chemical_list: D007126:Immunoglobulin Allotypes