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Welcome to
LifeMap Discovery

Watch the introductory video to learn more about our database of embryonic development for stem cell research and regenerative medicine

All in Vivo Cells > Cell Card
Extraembryonic Mesoderm
Extraembryonic Blood Islands

Primitive Erythrocytes (ExBI)


Primitive erythrocytes are cells that contain embryonic hemoglobin and mobilize oxygen in the body. These cells are large nucleated cells and only populate the blood during the first 6 weeks of gestation.

Primitive erythrocytes enter circulation at E8.5 in the mouse.  In humans, they are detectable from day 18.5 of gestation.

E7.5 - E9
Red Blood Cell, RBC
Primitive Erythrocytes
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent