If there's a question mark then inspect will document the mutation instead of taking a fragment. The next time that mutation appears it won't be a question mark and you should be able to inspect as normal.
So was I getting unlucky and didn't have repeat mutations to get fragments of?
I dunno what it is but even when I do manage to identify a mutation it's not a guarantee I get a fragment from it when it shows up again. I just can't get past the second mission anymore.
