Cx3cr1^{tm2.1(cre/ERT2)Litt}

A targeting vector was designed to replace exon 2 of the chemokine (C-X3-C) receptor 1 (Cx3cr1) gene with a cre/ERT2 (cre recombinase fused to an estrogen receptor ligand binding domain) coding sequence, followed by an internal ribosome entry site (IRES) and an enhanced yellow fluorescent protein (EYFP). A frt-flanked neomycin resistance cassette, in reverse orientation to the gene, was also inserted downstream of the EYFP sequence. Flp-mediated recombination excised the neomycin resistance sequence. (J:190965, J:205483)