Rh negative factor is considered as a mutation of unknown origin which happened in Europe 25000 yrs ago(?). This group spread heavily in to the area of Spain, ...
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strange-facts-about-rh-negative-blood
Aug 1, 2019 — This blood type is so rare that only 43 people on Earth have ever been reported to have it, and there are only nine active donors. Until 1961, ... 939c2ea5af
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