How many different human blood types are there, & what makes them different?
by 
- M.C.S. - Dave
ANSWERS: 1
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Phynotypically, there are four. Type A Type B Type AB Type O Genotypically, there are six Type AA Type AO Type BB Type BO Type AB Type OO They Differ in the antigens which is the A antigen and the B antigen. O types means the blood cell has no antigen
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