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Fig. 6. (A-C) Genetic interaction between Dkk1 and Lrp6 indicated
by rescue of postaxial polysyndactyly in double mutants. All mice are
homozygous for the doubleridge allele, Dkk1d. The
extra digit in the doubleridge single mutant is marked by the arrow.
The frequency of partial and complete rescue is dependent on Lrp genotype
(Table 2). E16.5 forelimbs were
stained with alcian blue to reveal skeletal elements.