[Nuclear-cytoplasmic ratio and shape of erythroid cells of the reindeer embryo].

With the beginning of normoblastic erythropoiesis the nuclear-cytoplasmic ratio (NCR) in the erythroid cells increases. From the chromatophilic erythroblasts with NCR from 1.0 and more erythrocytes possessing the concavo-concave form are produced as a result of the nucleus elimination.