Generation of the dab2mu410 allele results in a mRNA null situation. (a) Scheme for the generation of the dab2 promoter knock-out. Two gRNAs (red dotted lines) were designed to remove the TSS and first translated ATG, resulting in a deletion of a 4.6 kb genomic fragment including the dab2 promoter. (b-c) Images of ISH stainings with a dab2 RNA antisense probe. At 24hpf, dab2 is expressed in the DA (red asterisk) and the PCV (blue asterisk) of wild type (b) and heterozygous (c) embryos, whereas no staining is detectable in homozygous mutants (d). ATG, first translated ATG; DA, dorsal aorta; hpf, hours post fertilization; ISH, in situ hybridization; PCV, posterior cardinal vein; TSS, transcription start site.
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