Expression pattern of SCL in experimental embryos at stage 23 shown by in situ hybridization. Embryos were injected with either (A) LacZ mRNA (control) or (B-C) truncated c-met mRNA into 2 dorsal-vegetable blastomeres. Yellow arrowheads indicate the absence of SCL expression. Black arrowheads indicate groups of endothelial precursor cells. Anterior is right for all embryos.