Scientists from Bristol University have found a another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way to mass produce blood that is another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way enough for hospital another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way . For another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way years, they could produce blood in a another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way . However, the another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way to do that was very another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way and they could not make a lot of blood. The new another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way means scientists can make an "unlimited supply" of blood. Researcher Dr Jan Frayne said another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way ways of producing red blood cells used stem cells that could only produce a limited amount of blood. She added: "We have [shown] a [workable] way to another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way manufacture red cells." Professor David Anstee, another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way researcher, told reporters his another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way now needs the another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way to make blood on a large scale – to mass produce it. He said that would be a another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way . He added: "The next another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way of our work is to look at methods of [producing more]." He told another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way that at first, they would produce only rare types of blood. He said these are difficult to find with traditional blood another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way . He said: "The first…use of [our] red cell another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way is likely to be for patients with another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way blood groups, because another challenge donation good laboratory many method older patients phase process product rare reporters slow suitable sustainably team technology way …red blood cell donations can be difficult to source."