Chrm4^{tm1b(EUCOMM)Hmgu}

The Ifitm2_intron_L1L2_GT0_LF2A_LacZ_BetactP_neo cassette was inserted at position 91757764 of Chromosome 2 (Build GRCm39) within an endogenous exon, creating an artificial intron that splits the original exon into two artificial exons, where the downstream artificial exon is critical. The cassette is composed of the intron of the Ifitm2 gene containing an FRT site followed by lacZ sequence and a loxP site. This first loxP site was followed by neomycin resistance gene under the control of the human beta-actin promoter, SV40 polyA, a second FRT site and a second loxP site. A third loxP site was inserted downstream of the targeted exon(s) at position 91759090. The critical artificial exon(s) were thus flanked by loxP sites and subsequent Cre-mediated excision deleted the critical sequence and the neomycin selection cassette yielding this knockout reporter allele. Further information on targeting strategies used for this and other EUCOMMTOOLs alleles can be found at http://www.knockoutmouse.org/about/eucommtools/vectors. (J:157065, J:188991)