(A)
Wnt5a knockout mouse embryos (E18.5, images from (Yamaguchi et al., 1999)) exhibit body axis, limb, and tail truncations in addition to underdeveloped external genitalia and craniofacial malformations, compared to their wild-type littermates. These physical features are phenocopied in Ror2 knockout mouse embryos (B; E12.5 embryos derived from previously described Wnt5a (Yamaguchi et al., 1999) and Ror2 (Ho et al., 2012) mutant lines, photographed by S. Srinivasan. Scale bar = 1mm), as well as in RS patients (C; image from (Person et al., 2010), photographed by J. Lohr) and bulldogs (C; French bulldog).