Electron microscopy of erythropoiesis in the avian yolk sac.
D000818:Animals; D001792:Blood Platelets; D002642:Chick Embryo / Q000166:cytology*; D004920:Erythropoiesis; D006410:Hematopoiesis; D007962:Leukocytes; D008854:Microscopy, Electron