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Hematopoiesis in the human conceptus and placenta Temporal appearance of hematopoietic cells in the yolk sac (YS), AGM region, liver and placenta of the human conceptus from gestational weeks in the first and second trimesters through term. BFU-E (burst forming unit-erythroid) represents the earliest erythroid progenitors. Multipotent progenitors can produce erythroid and myeloid lineage cells.
