Yes, Seamus thanks for the questions. For MK-4482, you're right, you're completely right, because of its mechanism-of-action, that it resembles a nucleoside base. It’s in fact, just a derivatized version of a cytosine. It can be incorporated into any nascent RNA strain that is made by an appropriate virus. It's just a function of how well the viral polymerase is willing to accept the modified base. And just as one expects a virus is built for speed, typically viruses their RNA polymerases for RNA viruses are more accommodating of different structures than our mammalian DNA-dependent RNA polymerases involved in making messenger RNA, for example. And so it has good selectivity and good properties in that regard and should work very well for a whole variety of RNA viruses in vitro, it does exactly that. So a whole set of RNA viruses could potentially be treated, including, broadly speaking coronaviruses that we haven't yet made the acquaintance of. We don't really want to make the acquaintance of these, but our expectation is that this is not our last pandemic and probably not the last pandemic caused by coronavirus. So MK-4482 has broad activity and is potentially useful in a variety of different settings. Let's first see how it does with respect to SARS-CoV-2. Regarding islatravir, we have – of course, we remain enormously enthusiastic about islatravir Phase 3 studies are ongoing for the first set of combinations for islatravir for treatment of HIV infected individuals. And we've also, as you say, been looking for compounds to partner with islatravir, and we have such compounds. One of them moving forward right now is MK-8507. And we also have a group of others. So we believe that we're in a good place with respect to those. But we're moving forward in a variety of different directions. And then with respect to pre-exposure prophylaxis, yes, because the long durability of islatravir, the potential for a once monthly oral in particular, which could be used anywhere in the world, I think, is extremely attractive. But beyond that, as we've shown, islatravir can be formulated in a implantable form, which is a polymer that is positioned underneath the skin and can be active for potentially a year. And that provides, just about as close to perfect chemoprophylaxis as one can get, it's nearly vaccine like. So we're pursuing that as well, and we're optimistic about the ability of islatravir to make a big change in terms of the prevalence of HIV-mediated disease and the incidence of HIV infection.