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Patients will survive for more than five years. so we really need to improve that. things have been getting a bit better with immuno therapies, but the immuno therapies which reactivate the immune system gets cancer relying on the t cells and we had thought that b cells, which are thought to more typically involve attacking viruses and bacteria were involved in targeting cancers, so it's a big shift in thinking and with a lie was to alter the way we think about immunotherapy and how we develop immunotherapy. you could eventually use this, hopefully they create a vaccine to prevent the cancer i...

And prevention of cancer. the bbc�*s science correspondent, james gallgher, has been explaining what researchers have found. it's absolutely fascinating and it starts from an idea that i don't think many of us are particularly comfortable with, the idea that we're actually something like 8% virus in the first place rather than being entirely human. and that's because over millions of years, a type of virus called a retrovirus has infected our ancestors. we are going back a long time here. and it leaves behind the trace of its own genetic instructions, those structures for building that virus...

It has been really tense day at aintree, a day of high drama. it began with the protesters which threatened to disrupt the most important race in the calendar, due to start at 5:15pm. everybody said they could not possibly, there were so many police surrounding the race and inside as well. protesters arrived, they sat down on the ground, we spoke to them, they said they were determined to disrupt the race, but still it was not believed it was possible. well, they did, the race was stopped for around 15 minutes as they go onto the track, nine protesters were arrested. a little bit about that or...

Animal rising, which threatened all week to disrupt the most important race in the calendar, the grand national, which was due to start at 5:15pm. everybody said they couldn't possibly, there were so many police surrounding the race course and inside as well. protesters arrived, they sat down on the ground, we spoke to them, they said they were determined to disrupt the race, but still it wasn't believed that it was possible. well, they did — the race was stopped for around 15 minutes as they go onto the track, nine animal rising protesters were arrested. a little bit about that organisation...

Anything they do would increase donald trump as my exposure and does make things more difficult for the publican party generally for seven that something perhaps the democrats can, as is a watch with some leisure. , , ., ., ~' can, as is a watch with some leisure. , , . can, as is a watch with some leisure, , . ~ leisure. just looking at them like -ictures leisure. just looking at them like pictures of _ leisure. just looking at them like pictures of the _ leisure. just looking at them like pictures of the courthouse, - leisure. just looking at them like| pictures of the courthouse, gary. but ...