Nucleotide substitutions in exon 5 replace five tyrosines with phenylalanine at positions 311, 318, 323, 337, and 338 (p.Y311F, p.Y318F, p.Y323F, p.(Y337_Y338delinsFF)). A loxP site flanked neomycin resistance gene cassette that was inserted into intron 4 was removed through subsequent cre-mediated recombination. (J:150550)