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What is the fourth important antigen other than A, B, O?

User Firkamon
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Final answer:

The fourth important antigen other than A, B, O in the ABO blood group system is the Rh antigen, specifically the Rh D antigen.

Step-by-step explanation:

The fourth important antigen other than A, B, O in the ABO blood group system is the Rh antigen, specifically the Rh D antigen. The Rh antigen is part of the Rhesus (Rh) blood group system and is the most important antigen in this system. People who have the Rh D antigen are Rh-positive (Rh+), while those who do not have this antigen are Rh-negative (Rh-).

User Bluebamboo
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