Exon 2 was replaced with an exon 2 containing a nucleotide substitution that resulted in the amino acid substitution of alanine for serine at position 112 (S112A). A floxed neo cassette downstream of the modified exon 2 used for selection purposes was removed by cre-mediated recombination in ES cells. This mutant version of PPARgamma is nonphosphorylatable and has more biological activity. (J:135904)