Rap1b is required for vascular integrity in vivo. (A,B) Whole-mount in situ hybridization of 24 hpf zebrafish using probes for rap1b (A) and vecdn (VE-cadherin) (B). (C-F) Transmitted light images of the heads of animals injected with 8 nanograms of control (C,D) or rap1b (E,F) morpholino (MO). ICH in the rap1b MO-injected animals (black arrows) (E,F). (G) Quantitation of the percentage of animals developing ICH by 48 hpf after injection of: (1) control MO, (2) rap1b MO, (3) control MO + hRap1b mRNA, (4) rap1b MO + hRap1b mRNA, (5) control MO + fli1:hRap1b DNA, (6) rap1b MO + fli1:hRap1b DNA, (7) rap1b MO + fli1:hRap1b DNA. The amount of MO (in nanograms) and DNA and RNA constructs (in picograms) injected per animal, and the total number of embryos injected and scored (N #) are shown. Anterior is to the left, and dorsal is either above (A-C,E) or coming out of the plane of the page (D,F). Bars, 250 μM.