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they are immature red blood cells, they are nucleated cells. they usually appear frequently in the blood smear if there is a type of anaemia present as a compensatory action by the body.
Reticulocytes are immature red blood cells, typically composing about1% of the red cells in the human body. Reticulocytes develop and mature in the red bone marrow and then circulate for about a day in the blood stream before developing into mature red blood cells. Like mature red blood cells, reticulocytes do not have a cell nucleus. They are called reticulocytes because of a reticular (mesh-like) network of ribosomal RNA that becomes visible under a microscope with certain stains such as new methylene blue.