What are blood groups?

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 https://t.me/c/1318733502/16633
 
What are blood groups?
 
The assertion of blood groups is an attempt to explain the phenomenon of "incompatibility" of blood from different people in terms of Mendelian genetics.
 
Since the energy content of the cell membranes and the proteins dissolved in the body and blood is constantly changing, the blood groups also change. 
There are currently 29 "officially" approved blood group systems. In the West, the Landsteiner 4-system, created by the inventor of the "polio virus", is currently valid. The discrepancies have been resolved by the introduction of umpteen sub-groups.
 
Ultimately, there are as many blood groups as there are people.
 
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