MNS and Duffy Blood Group Systems
The MNS blood group system antigens (M, N, S, s, U, and other high- and low-frequency antigens) are carried on glycophorins A and B, or hybrid proteins thereof. Antibodies to these antigens can be clinically significant, especially anti-S, anti-s, and anti-U. The Duffy blood group system antigens (Fya, Fyb, Fy3) are carried on the atypical chemokine receptor 1 (ACKR1). Antibodies to the Duffy anti
