A pair of TALENs targeting exon 1 of the Fh gene was injected into SD embryos to create Fh knock out mutants. The resulting mutation was an 11-bp deletion (acacctttggt) on exon 1 that caused premature stop of FH protein. Breeding of Fh +/- rats was done to generate wildtype (Fh+/+)and Fh (+/-). No homozygous mutant were observed.