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Figure 1 Endothelial cells and red blood cells were labeled by EGFP and DsRed respectively in double transgenic Tg(fli1:EGFP)y1;Tg(gata1:DsRed)sd2 embryos. (A) Red blood cells accumulate in dilated segments of the caudal vein of ccm2 CRISPR fish at 2 days post fertilization (dpf). (B) cas9 mRNA-injected control embryo. (C) ccm2 CRISPR embryos showed accumulation of red blood cells and intraluminal endothelial cells in a dilated segment of caudal vein in contrast to a control embryo. Note: In this and all succeeding sagittal views, anterior is to the left (D). (E) ccm2 CRISPR embryos occasionally showed dilations of cerebral veins, whereas control embryos (F) showed normal development of cerebral veins (F). MCeV: mid-cerebral vein, PMBC: primordial midbrain channel, PHBC: primordial hindbrain channel. (G) The dilated caudal venous plexus (CVP) and heart of ccm2 CRISPR embryos were rescued by ccm2 mRNA injection. p=0.0336 (dilated CVP), 0.0037 (dilated heart). p-Values were calculated using an unpaired two-tailed Student’s t-test. (H) Phenotypic distribution of dilated heart, CVP, and cerebral veins (CV) in ccm2 CRISPR embryos at 2 dpf. p=0.0078 (dilated CVP), 0.0268 (dilated heart), 0.0041 (dilated CV). p-Values were calculated using a paired two-tailed Student’s t-test. Error bars indicate SD. Scale bar: 1 mm in A and B, and 100 µm in C through F.