The endogenous Wnt4 locus has been mutated such that the conserved WGGC sequence has been deleted and a downstream stop codon has been added.
Wnt1002/Wnt1091, Wnt409/Wnt421 has abnormal neuroanatomy | P-stage phenotype
Wnt1002/Wnt1091, Wnt409/Wnt421 has medulla | P-stage phenotype