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The catalytic domain of this gene, encompassing subdomains V and VI, was replaced with a neomycin resistance cassette via homologous recombination which introduced stop codons in all 3 reading frames and results in a truncated kinase lacking amino acids 130-383. Northern blot of spleen from homozygous mutant animals verified the absence of gene expression and kinase assay of mouse embryonic fibroblasts verified the absence of enzyme activity. (J:59678)