Enlargement of blood islands in cubilin mutants. Shown are H&E stained sections of an 8–8.5 dpc wild-type (A) and mutant (B) embryo. Cand Dshow high magnification views of blood islands from embryos shown in A and B. Embryos in panels A and B are oriented such that anterior is to the right and posterior is to the left. BI, blood island. Bars in A and B = 100 μm. Bars in C and D = 25 μm.