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Fig. 1. All three FGFR double mutants are generated. (A) Crosses
designed to obtain the three possible combinations of FGFR double mutants. The
Fgfr1 and Fgfr2 mutant alleles are floxed, whereas the
Fgfr3 allele is a null. The embryos homozygous mutant for
Fgfr2 and Fgfr3 are also heterozygous mutant for
Fgfr1. Whole E12.5 control (B) and
Fgfr1;Fgfr2 double mutant (C) embryos. The mutant, as
well as having a smaller telencephalon (arrow), loses the frontonasal process
(arrowhead).