Most US donors are Caucasian, amongst whom 45% of people are bloodgroupo.
大多数美国供血者是高加索人，其中的45%是O型血。
2
Objective To develop a procedure for batch preparation of universal red blood cells converted from group B to groupO and provide universal red blood cells for clinic.
目的建立B→O血型转换红细胞（通用型红细胞）批量制备工艺，为临床提供通用型红细胞制品。
3
Type O is the most common bloodgroup, but stocks constantly run low because it is used in all emergency situations where there is no time to determine the patient's own group.