As Rhnull blood contains no Rh antigens to be rejected, it can be a universal donor for those with generally rare blood types.

由于Rhnull型的血液不含会被排斥的Rh抗原，它可以为那些拥有罕见血型的人提供通用供体。

Much like A and B, you either have the Rh antigens, in which case you're Rh positive, or your don't, and are Rh negative.

就像 A 和 B 一样，你要么有 Rh 抗原，在这种情况下，你是 Rh 阳性，要么没有，是 Rh 阴性。

Until then, doctors had assumed that an embryo missing all Rh blood cell antigens would not survive, let alone grow into a normal, thriving adult.

在此之前，医生们一直认为缺少所有Rh血细胞抗原的胚胎无法存活，更不用说成长为一个正常、茁壮的成年人了。

But, as the name implies, the Rhnull blood type is completely missing these Rh blood group antigens, which makes it the rarest blood type in the world.

但是，正如该血型名字所暗示的那样，Rhnull血型便没有这些Rh血型抗原，这使它成为世界上最罕见的血型。