Erythroblast A immature RBC containing a ... deficiency of erythroblasts in bone marrow (Diamond-Blackfan Syndrome) Erythrocyte RBC; a nonnucleated biconcave disk approximately 7 µm in diameter ...

The main causes of acquired anemia can be divided into loss of blood (hemolysis or hemorrhage) or inadequate bone-marrow function (e.g. ineffective erythropoiesis, sideroblastic changes ...