Fig. S3

erg overexpression expands vascular precursors at the expense of other haemangioblast-derived lineages. In situ hybridisation gene expression analysis in the presence/absence of erg overexpression at 12 hpf, comparing vascular, myeloid and haematopoietic precursors (as marked by flk1, spi1 and gata1 expression, respectively). erg overexpression consistently leads to expansion of vascular precursors at the expense of myeloid and haematopoietic lineages, suggesting that erg is acting to bias specification of haemangioblasts towards a vascular fate. (x/y) indicates the number of embryos displaying the phenotype shown (x) and the total number of embryos in the treatment group (y).