The targeting vector is designed to insert a CMV-IE enhancer/chicken beta-actin/rabbit beta-globin hybrid promoter (from pCAGGS), loxP-frt-neomycin resistance cassette-loxP-frt-loxP sequence and polyA signal at the centromeric end of the coronin actin binding protein 1A locus (Coro1a) gene. The insertion site is 1165 bp centromeric (transcriptionally downstream) of the last exon. (J:210018)