Yes, that's a really good question. And as I said in the prepared remarks, we've been very, very fortunate because of the really phenomenonal location of virtually all of our assets and, I think, the very high quality of those assets. And our leases to big pharma by and large are critical research components of big pharma. They're not SG&A outposts, they tend not to be manufacturing, and they tend not to be kind of main campus operations where, in case of an acquisition or a major restructuring those things get closed down. I mean, if you just look at a couple of the ones I mentioned to give you a little bit of color on that bear with me one second; let me just go back to the couple that I mention - if you look at the four that I mentioned, Pfizer, well, Pfizer, as you know, with the Wyeth acquisition, which we think is probably a pretty smart acquisition, has closures in a number of different locations. We don't think those are typically going to hurt us in the triple A core life science markets if you're in the right location; if you aren't, then you can get killed. But the Pfizer locations, they opened an operation at Tech Square which was a critical operation of their Capsugel division. And also signing up for Mission Bay, which is a new bio innovation and bio therapeutic focus. That's the very thing that they're trying to do, is to move outside of the traditional campuses. Same thing with Merck. We were benefited by their acquisition of Sirna in Mission Bay and that’s a mission critical research location. We don't see any space affecting us at Mission Bay particularly. Glaxo, they're our second-largest tenant and, through a number of acquisitions, there again in a number of locations, but including Cambridge, which has now been enhanced to one of their primary research focal points. It was mentioned specifically by Andrew Witty. And they cut another kind of comparable - not on the same science comparability, but another group; I think it may have even been England or another location that didn't impact us. And same thing with Novartis. So by and large, we've been substantially benefited. And I don't think in any of the markets we're going to see - again, in great core markets we're going to see a lot of sublease space come onto the market. That's just the nature of these assets and these unique locations.