So it's relatively conserved. So we have a glycine followed by four x's, where the x basically describes some type of arbitrary amino acid. And then we have glycine and lycine. Now, what we see happen is the NH groups that are basically found on the backbone of this pilot will interact, will form hydrogen bonds with the negative charges of these oxygen on the triphosphate. And likewise, if we have any residue that contains a positive charge. So if we have basic residues such as lysine and arginine found on a PLOOP, those will also form interactions with this triphosphate.