Most US donors are Caucasian, amongst whom 45% of people are blood group o.
大多数美国供血者是高加索人，其中的45%是O型血。
Objective To develop a procedure for batch preparation of universal red blood cells converted from group B to group O 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。
Type O is the most common blood group, 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.
型血是最常见的血型，但储存量总是很少，原因是在所有紧急事件中当没有时间鉴定病人的血型时总是使用O型血。
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