CrateDane t1_iyek2zs wrote
Reply to comment by [deleted] in Can someone with an O Rh- blood type really donate blood to every single human being on earth or is there more nuance to it? by Yalkim
> They're defined based on presence (or absence) of certain proteins on the surface of red cells.
Presence or absence of certain glycosylations. The proteins are there regardless of blood type.
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