(A) Schematic representation of the experimental design. The GIMAP enhancer (eG) was introduced into the reporter construct carrying a minimal promoter sequence (promoter) and an eGFP gene. The RUNX1 stem cell enhancer (eR1) was cloned into the reporter construct encoding the DsRed gene. The reporter constructs were injected into a single-cell zebrafish embryo. The cartoon displays regions of zebrafish hematopoietic tissues. The kidney marrow (KM), aorta-gonad-mesonephros (AGM), caudal hematopoietic tissue (CHT), and thymus (T) are indicated. (B) Activation of the reporter constructs in early hematopoiesis in zebrafish. Fluorescent images show one representative zebrafish embryo (n=16) injected with reporter constructs at 2 and 3 dpf. The AGM and CHT are indicated by white and red arrowheads, respectively. Scale bar, 1 mm.