The most mature developing red blood cell that still contains a nucleus is a:

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A polychromic erythroblast is the last stage of erythropoiesis before the red blood cell loses its nucleus and becomes a mature erythrocyte. It still contains a small amount of RNA and appears bluish-purple under a microscope. Reticulocytes are the immediate precursors to mature red blood cells, but they have already expelled their nuclei. Basophilic erythroblasts and proerythroblasts are earlier stages in erythropoiesis and contain larger, more visible nuclei.

The Most Mature Developing Red Blood Cell That Still Contains