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Fig. 1. Disruption of the mouse Icap-1 gene. (A) Partial
structure of the mouse Icap-1 gene and the targeted allele after
homologous recombination. Black boxes represent exons (E2 to E7). The
initiation codon (ATG) is located in exon 2. The expected fragment sizes for
wildtype and recombinant alleles are 20 and 10 kb, respectively, following
digestion with BamHI and hybridization with the indicated external
probe (ext pb). (B) Southern blot analysis of tail DNA isolated from
wild-type, heterozygous mutant and homozygous mutant mice. (C) Northern
blot analysis of total RNA derived from adult kidney of wild-type,
heterozygous and homozygous mutant mice. The filter was hybridized with probes
specific for Icap-1 and Gapdh, respectively. (D)
Western blot analysis of wild-type, heterozygous and homozygous mutant brain
extracts. (E,F) Whole-mount lacZ staining of heterozygous
mutant embryos at E8.5 (E) and E14.5 (F).