An immature RBC that has just lost its nucleus is referred to as a:

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The young RBC that has just extruded its nucleus is referred to as a reticulocyte.It is about the same size as or slightly larger than a mature RBC.Reticulocytes differ from mature RBCs morphologically because they contain a fine basophilic reticulum or network of RNA,a cytoplasmic remnant that decreases as the cell matures.When stained with Wright stain,reticulocytes appear pink-gray or pale purple-they have a slight bluish tinge.This polychromasia (many colors)represents the presence of RNA within the cell.With a special stain,such as brilliant cresyl blue or new methylene blue,the basophilic reticulum of RNA appears blue.Under normal conditions,reticulocytes remain and mature further in the bone marrow for a day or two before they are released into the peripheral blood.Normally about 1% of the circulating RBCs are reticulocytes.

An Immature RBC That Has Just Lost Its Nucleus Is