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This video explains what blood types (ABO and Rh groups, specifically) mean in terms of antigens and antibodies and why certain types are incompatible with others.

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0:00 Intro
0:35 Antigens and Antibodies in ABO System
3:39 Agglutination
4:45 Ex1 - A blood donated to B blood?
5:43 Ex2 - O blood donated to A blood?
6:20 Ex3 - Universal donor and universal acceptor
8:03 Rh Group
9:41 Why Mortimer Can’t Donate Blood