Vil1^tm1Gum

A targeting construct containing lacZ and neo replaced 4.6 kb of genomic sequence encompassing a portion of the first coding exon (exon 1) and the following 2 exons (exons 2 and 3). An upstream non-translated exon was left intact. While low levels of aberrant transcipt were detected in mutant mice, neither normal nor truncated protein was detected by Western blot analysis. (J:77460)