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To be honest, it's not particularly novel. What they have done, however, which is a bit interesting is introduce a new bell or a new whistle, if you like, in terms of the virus, which is to also have an effect on some of the supporting cells. So one of the things that's very exciting about current cancer biology is an increased understanding of the fact that while you've got cancer cells and tumor cells, which are important targets; actually there's a lot of supporting cells around the cancer that also get modified in that environment and start to mis-behave.