2. Reticulocyte Formation Process

The formation of reticulocytes starts in the bone marrow. They begin as stem cells, the building blocks of all new blood cells. Then they go through a maturing process, eventually becoming red blood cells. Reticulocytes spend about three days in the bone marrow before they enter the bloodstream. Then they take another day to mature into red blood cells.

process Reticulocytes Jezperklauzen / Getty Images

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