Yolk sac erythropoiesis.
D000818:Animals; D002454:Cell Differentiation; D002642:Chick Embryo / Q000502:physiology*; D046508:Culture Techniques; D004912:Erythrocytes / Q000166:cytology / Q000196:embryology; D004920:Erythropoiesis; D011784:Quail; D015017:Yolk Sac / Q000502:physiology*