According to the allele molecular image presented by the International Knockout Mouse Consortium, this allele has one FRT site, an engrailed 2 splice acceptor sequence, an EGFP and cre/ERT2 expression cassette, and a neomycin resistance cassette inserted between exons 2 and 3. A single loxP site is inserted between exons 4 and 5. (J:155845)