Scientists from 90 countries recently said that they have successfully used the embryonic stem cells to artificially cultivate type O rh-negative blood in the laboratory for the first time. Because type O rh-negative blood is called "universal blood type", it can be matched with any other blood type, which makes it Humans will no longer have to worry about blood strain. If the following are true, the above conclusions can be weakened most:. ['After induction, pluripotent stem cells may also produce blood.', 'Insufficient blood supply is not a fatal threat to many patients.', 'Artificial culture of O-negative blood using embryonic stem cells is now more expensive.', 'Type A. B, and AB blood Rh negative type as raw materials for the production of type O Rh negative blood, these blood types are also scarce.']