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The combinatorial HoxB4/GATA1 character is present at the two earliest sites with demonstrated HSC potential, viz., 10.5dpc AGM (A–C) and 11.5dpc fetal liver (D–F). Colored arrows represent cells that are either HoxB4 only (green), GATA1 only (red), or both (yellow). Arrow orientation marks the same cell along each row. Anterior is to the left in D and all sagittal sections.
