Exon 2 and 3 were replaced with a full-length cDNA containing nucleotide substitutions that result in the amino acid substitution of cysteine for phenylalanine at position 350 (F350C) fused to EGFP and followed by a floxed neomycin ressitance cassette. Flp-mediated recombination removed the selection cassette. (J:205754)