I screencapped the level and made 2 comments about it: the protein you're supposed to mutate can't be mutated (I checked other parts of the protein and nothing was able to) and I was pretty sure it wasn't my fault but a bug when I saw a bond between nothing and an acceptor/receptor (purple blob)
I can see how that hint is confusing. It is actually talking about that protein chain being mutatable (as opposed to the DNA that cannot be changed) but obviously the section it is pointing to cannot be mutated.
If you click on "Tell me more…" then you should get the attached hints that point to the 2 residues that can be mutated.
As for the random hydrogen bond, that one is pointing to nothing because the first residue is actually hidden for simplicity, but we should get rid of that (or show the first amino acid) and change the first hint to point to the correct area.