Cre-mediated excision of the parental Serinc5tm1a(KOMP)Wtsi allele resulted in the removal of the promoter-driven neomycin selection cassette and critical exon 3 leaving behind the inserted lacZ reporter sequence. RT-qPCR shows significantly lower mRNA transcript levels in homozygotes. Further information on targeting strategies used for this and other IKMC alleles can be found at http://www.informatics.jax.org/mgihome/nomen/IKMC_schematics.shtml. (J:291232)