The last coding region of exon 1 is replaced by a loxP-flanked mCherry-V5-His and an FRT-flanked neomycin-resistant gene cassette. The mCherry-V5-His cassette and neomycin-resistant gene cassette were removed by crossbreeding with a CAG-Cre deleter mouse and a CAG-FLPe deleter mouse, respectively. (J:276267)