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Exons 2 and 3 encoding amino acids 12-194 were replaced with a PGK-neo cassette via homologous recombination. RT-PCR analysis of mouse embryonic fibroblasts (MEFs) from homozygous mutant animals using primers 5' of exon 2 and 3' of exon 3 detected low levels of truncated mRNA resulting from the splicing of exon 1 to exon 4, and sequencing of the product confirmed the deletion of exons 2 and 3. Western blot analysis of MEFs from homozygous mutants detected low levels of truncated protein product. (J:75272)