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Fig. 8. Rescue of anterior head truncation in Dkk1 null mice by reduced
expression of Lrp6. (A) Single mutants that are null for
Dkk1 lack anterior structures of the head, which results in neonatal
lethality. The null phenotype is rescued in double mutants which are
heterozygous for the null allele of Lrp6, shown at E16.5 (B) and P30
(C). Lateral deviation of the lumbar vertebrae in the P30 double mutant is
evident in the skeletal preparation (D).