An immature red blood cell that is still developing in bone marrow before it becomes a mature, fully functional red blood cell.
From Greek 'erythros' (red) combined with 'blast' meaning 'immature cell' or 'germ layer.' The term emerged in 19th-century hematology as scientists studied blood cell development.
Erythroblasts are red blood cells still in their teenage years—they're in bone marrow's version of high school, learning how to carry oxygen before they're released into your bloodstream as fully mature cells ready for action.
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