Amino acid replacement: H?Y.
The equivalent mutation to the ALS-associated H71Y mutation in Hsap\SOD1 has replaced the endogenous gene at the Sod1 locus. (Note names are based on the Hsap\SOD1 amino acid numbering system.) A LoxP "scar" of 72 nt remains. (Note that this allele also contains a natural A1013C polymorphism, which leads to the N98K missense mutation, according to the human amino acid numbering system.)
CAT11112707TAC
CAT?TAC
H70Y | Sod1-PA
Analogous mutation in human SOD1 implicated in ALS; CAT to TAC mutation introduced into fly gene by homologous recombination; site of nucleotide substitution in fly gene specified by author. H71 in human SOD1 aligns with H70 in Drosophila ortholog Sod1.