A cDNA encoding amino acids 89-665 was inserted into exon 2, in which nucleotide substitutions result in the amino acid substitution of phenylalanine for tyrosine at positions 603 and 632 abolishing the SHP2-binding domain (Y603F and Y632F). A floxed neo cassette inserted downstream of exon 2 was removed by cre-mediated recombination. (J:178045)