A construct containing a loxP site, splice acceptor, mouse Reg3g cDNA, FRT site, pgk-neo cassette, polyA sequence, splice donor, FRT site, loxP site, splice acceptor, and eGFP replaced exon 2 via homologous recombination. Cre mediated recombination removed the neo cassette and Reg3g cDNA. (J:331545)