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

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