cebpa gain-of-function phenotype. Overexpression of cebpa induced ectopic expression of blood markers on X tropicalis embryos. Embryos randomly injected with 10-pg cebpa mRNA into one cell at 8-cell stage were fixed at stage 18 for whole mount in situ hybridization for spib (A-D) and mpo (E-H). Panels A, B, E, and F are dorsal views (anterior to the left). Panels C, D, G, and H are lateral views (anterior to the left and dorsal to the top).