These types of issues can be very complex. They're not clear-cut. The answer is not always twofold. We'll be looking at a myriad of evidence. Some of the work that we've done to date in some of the other allergy cases, they are not about pets, but we're a bit further along. We're looking at such issues as the circulation in an aircraft cabin. We're looking at some of the specialists' reports that have been tabled with the agency.
There are a lot of pieces to pull together as the agency weighs the evidence.