Yeah, thanks. Excellent question, Roger. I mean, as you know, 1687 for folks on the phone, this is clear this other asset that we have cleared IND back in June of last year. And given where the markets were, the financial constraints we had, we really had to double down on our Phase 3. We're very excited now to be able to be in a situation where we're able to start the Phase 1a of 1687, a compound we believe in, we have the deep expertise, as you know, in this area in sickle cell, and bringing that expertise on our second generation, E-selectin antagonist, that is potent and subcutaneously bioavailable. So the first step of that, Roger, as you know, is that single ascending dose, as Ed mentioned. And really, it's a healthy volunteer study. So I don't want to read more into it, than then what it is. It's really to give us the PK/PD safety signals, which are really needed at first step. And quite honestly, regardless of what indications we go, that single ascending dose trial and the Phase 1a is very consistent and the same. So we're going to be doing this, typically these volunteer trials they don't take that much time but it's usually in the month. So sometime, I would say next year we should have that information. It's just too early to tell now. Let's get started. As we're announcing today, we are planning to start. We haven't started yet. So let's get started and we'll keep the market updated about it. But I'm very excited about the ability to start 1687 and put yet another GlycoMimetics product in a first-in-human study in the marketplace.