Which other antigen belongs to the MNSs blood group system?

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Multiple Choice

Which other antigen belongs to the MNSs blood group system?

Explanation:
In the MNSs system, antigens M and N are on glycophorin A, while S, s, and U are on glycophorin B. The U antigen is a classic, high‑frequency member of the MNSs group and is commonly discussed alongside S and s. Therefore, U clearly belongs to the MNSs system. Lea is a Lewis system antigen, and P1 is a P system antigen; M is also part of MNSs, but this item highlights U as the representative other antigen to recognize in this system.

In the MNSs system, antigens M and N are on glycophorin A, while S, s, and U are on glycophorin B. The U antigen is a classic, high‑frequency member of the MNSs group and is commonly discussed alongside S and s. Therefore, U clearly belongs to the MNSs system. Lea is a Lewis system antigen, and P1 is a P system antigen; M is also part of MNSs, but this item highlights U as the representative other antigen to recognize in this system.

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