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During embryonic development, the erythrocytes are generated from two waves of hematopoiesis.In zebrafish, the primitive wave occurs in ICM and the definitive wave of hematopoiesis occurs in AGM.The transcription factors that regulate erythrocyte specification are all expressed in the hemangioblasts at 2 somite stage.After commitment, the GATA factor is switched from GATA2 to GATA1, a process referred to as GATA factor switching.