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The ability of a cell to transform into any type of cell in an embryo is called as a stem cell.
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The stem cell that forms red blood cells or rbcs is called as hemocytoplast.
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Hemocytoblast, the name refers.
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Hemo means blood.
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Cytocytes means cell.
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Blast means early cell formation.
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So hemocytoblast is the early stem cell that has been unprogrammed for an rbc.
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So the stem cell reaches a committed cell stage which is referred to as the cell has been committed to become a red blood cell.
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So the committed cell is now called as pro erythroblast, which is the precursor or progenitor for erythrocytes.
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So pro erythroblast is a progenitor cell for rbcs or erythrocytes.
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So these transform into early erythroblast which forms ribosomes.
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The ribosomes are actively participating in protein synthesis.
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Early erythroblast are packed with ribosomes till their late erythroblast stage.
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So the next stage is late erythroblasts...