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Scientists Bristol University the UK say they have found a way to mass produce blood that would be suitable patients who need it hospitals. For a number years, they have been able to produce red blood cells a laboratory. However, the process to do that was very slow and they could not produce a lot blood. The new technique means scientists can make an "unlimited supply" blood. Researcher Dr Jan Frayne said: "Previous approaches to producing red blood cells have relied various sources stem cells which can only presently produce very limited quantities." She added: "We have demonstrated a feasible way to sustainably manufacture red cells clinical use."

Professor David Anstee, another the researchers, told the BBC that his team has found a way to mass produce blood, but they now need the technology to actually do this a large scale. He said: "There is a bioengineering challenge. To produce that much [blood] is quite a challenge….The next phase our work is to look methods of [producing more]." He told reporters that to begin , they would produce only rare types blood, as these can be difficult to find traditional blood donation sources. He said: "The first therapeutic use a cultured red cell product is likely to be patients rare blood groups, because suitable conventional red blood cell donations can be difficult to source."

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