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Fig. 4. Effect of varying Dkk1 expression on development of anterior head
structures. (A) Normal head development in Dkk1d/d
homozygote; (B,C) two viable Dkk1d/ compound
heterozygotes with closed eyes and hydrocephaly. (D-G) Skeletal preparations
stained with Alcian Blue and Alizarin Red: (D) wild type at P0; (E) severely
affected Dkk1d/ compound heterozygote with
anophthalmia at P0; (F,G) head development in two
Dkk1/ null homozygotes at E18.5.