'Milestone' in quest to make blood cells: studiesScientists on Wednesday unveiled two methods for coaxing stem cells into blood cells, a long-sought goal that could lead to new treatments for blood disease, including leukaemia. In separate experiments reported in Nature -- one with mice, the other transplanting human stem cells into mouse bone marrow -- researchers demonstrated techniques with the potential to produce all types of blood cells. "This step opens up an opportunity to take cells from patients with genetic blood disorders, use gene editing to correct their genetic defect, and make functional blood cells," said Ryohichi Sugimura, a doctor at Boston Children's Hospital and lead author of one of the studies.