Scanning electron micrographs of wild-type (A,C) and
Tbx5del/del (B,D) embryos at E9. Limb bud outgrowth is
apparent in wild-type but not in Tbx5del/del embryos
(arrows in A,B, asterisks in C,D). Lateral plate mesoderm is seen in embryo of
either genotype as a ridge along the side of the embryo.