All of the following antigens define the Kidd blood group system except which one?

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Multiple Choice

All of the following antigens define the Kidd blood group system except which one?

Explanation:
The Kidd blood group system is defined by antigens on the red cell that include Jk^a and Jk^b as the two main, well‑characterized antigens, plus Jk3, a high‑incidence antigen present on nearly all red cells. In(Jk) is not a recognized Kidd antigen, so it does not define this system. That’s why it’s the correct choice as the exception.

The Kidd blood group system is defined by antigens on the red cell that include Jk^a and Jk^b as the two main, well‑characterized antigens, plus Jk3, a high‑incidence antigen present on nearly all red cells. In(Jk) is not a recognized Kidd antigen, so it does not define this system. That’s why it’s the correct choice as the exception.

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