In the mammalian embryo, where are the sites of primitive hematopoiesis?
yolk sac and aorta-gonad mesonephros (AGM) region
Where is the majority of blood cells produced in adult mammals?
bone marrow
Where is the majority of blood cells produced in adult birds?
bone marrow
Where is the majority of blood cells produced in adult reptiles?
bone marrow; sometimes spleen
Where is the majority of blood cells produced in amphibians?
kidney, liver, spleen, and/or bone marrow
Where is the majority of blood cells produced in fish?
kidney and/or spleen