Embryos from the indicated cross were collected at E18.5, scored as alive or dead based on the presence or absence of a heartbeat, and genotyped. Note that 31 Fib^-/-: Par4^-/- embryos were collected and 30 were alive. Of these 30 embryos, 28 appeared to be normal and were indistinguishable from their littermates. Two embryos were alive but showed intra-abdominal bleeding.