Regarding antigens in the Duffy system, all of the following statements are true except
a. Commonly encountered antigens include the allelic pair Fya and Fyb.
b. Duffy antigens are well developed at birth.
c. Fy3 and Fy5 antigens are destroyed by treatment with ficin enzyme.
d. Fyx is a weak expression of the Fyb antigen.
Answer: c
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