A loxP-flanked PGKneo cassette site was inserted upstream of exon 7 and a third loxP site was inserted downstream of exon 16. Cre-mediated recombination removed the neo cassette. Exons 7 through 16 were subsequently removed from properly targeted mice by crossing to transgenic mice carrying Tg(EIIa-cre)C5379Lmgd. (J:94077)