Amino acid replacement: R?term.
Mutation in sequenced strain: premature stop (nonsense mutation) (see FBrf0168007).
Site of polymorphism between strains. The codon is TGA (stop) in the reference sequence (leading to early termination) and CGA (Arg) in Oregon R.
Dunipace et al. (FBrf0137203) concluded that Gr22d was a pseudogene on the basis of this mutation. However Robertson (FBrf0168007) shows this to be a strain specific mutation.