The last two exons of the gene (exons 19 and 20), including the 3' UTR, were duplicated and inserted downstream of the polyadenylation signal and a neomycin selection cassette flanked by FRT sites. Two loxP sites were inserted to flank the native exons 19 and 20 as well as a neomycin stop cassette. The sequence for mVenus was fused in frame to the end of the coding sequence in exon 20. The FRT-flanked neomycin cassette was excised through crosses with a germline flp strain. (J:218842)