FGF17 and omphalocele: We observed that in the triple mutants, the recovery rate of omphalocele was 71% (Fig. 2G); when both copies of Fgf17 are intact in a TCre;Fgf8f/Δ-;Fgf18f/Δ background this rate was reduced to 52% (Fig. S4), suggesting a role for Fgf17, although this reduction was not significant (P=0.1733, two-tailed Fisher's exact test).