A mutation was engineered in exon 10 (ENSMUST00000059287) to change phenylalanine codon 613 (TTT) to aspartic acid (GAT( (p.F613D) and a loxP site flanked neomycin resistance gene cassette was inserted into intron 9. The neo cassette was deleted through subsequent Cre-mediated recombination. (J:115873)