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mouse models, the earliest mast cell progenitors originate in the embryo around embryonic day 7 (E7.5-E8.5). Transient erythro-myeloid progenitors (EMPs) develop in the yolk sac between E8.5-E10.5 and in fetal liver (FL) between E11.5-E13.5. Embryonic multipotent progenitors (eMPPs) and hematopoietic stem cells (HSCs) emerge around E10.5. Mast cell differentiation in the fetal liver (FL) starts from E11, along with a peak in the number of mast cell progenitors. Mast cell progenitors then enter the circulation

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