In addition to being grouped into four blood groups, namely A, B, AB, and O, blood groups are also distinguished by Rhesus (Rh) factors. The factor of Rhesus or Rhesus is the innate protein that is on the surface of red blood cells.
Rh tests are as important as checking blood type, which is to determine a person's blood group. The aim is for someone to be easier when they receive
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