Probably the mutation would be "accepted" by the Were's regeneration system as "normal", since for that Werewolf, it would be physically normal on a genetic level.
I suspect that in the PItW universe, nobody has tried sequencing Werewolf genes against standard Smoothskin Human genes. After all, if something were found different, the researcher would want to see just what that aberration did to the person that had it, and one doubts that saying "It was an anonymous donation" would work. Then again, Werewolves might check out as perfectly human, genetically.
Were that to happen, I'm sure Gus would demand a re-test, if no-one else.
And when asked why; he'd probably be dumb- or arrogant enough to
say why...
KMacK...
"You don't have to be invisible when everybody is looking the wrong way..."
Writing the series "Wulfen Blood"... getting ready for publication.