FLP-mediated recombination in the parental Ccl20tm1a(EUCOMM)Hmgu allele resulted in the removal of the promoter-driven neomycin selection cassette and the beta-galactosidase gene leaving exon 2 flanked with loxP sites. 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:240732)