1. Exactly. But type O is called the "universal donor" since it doesn't have any antigens that would set off the body's defense system.

2. My blood is type "O", so I'm a universal donor.

3. These methods provide promising way to make universal donor blood and may have significant application in transfusion medicine.

4. The military in particular needs a constant supply of fresh, universal donor blood for battlefield situations when normal supplies from donors can quickly run out.

5. Because he had type O blood, he happily said he was a " universal donor ".