The KOMP vector PG00072_X_1_H08 inserted the FRT-flanked lacZ/neomycin resistance cassette with a 3' loxP site upstream of exon 4 and an additional loxP site down stream of exon 4. Flp-mediated recombination removed the reporter and selection cassette. Cre-mediated recombination removed exon 4. (J:332344)