A Researcher Is Comparing Surface Antigens X and Y from Two

A researcher is comparing surface antigens X and Y from two distinct viruses. He acquires antigen X antibodies from an animal that has previously been exposed to the virus encoding this antigen. After that, the antibodies are added to test plates. Following that, a set amount of radiolabeled X antigen is applied to the plates. Unlabeled Y antigens are then given to each plate in escalating quantities, and the plates are washed to eliminate unbound antigens. The graph below depicts radioactivity as a function of Y antigen concentration. . Which of the following best describes the results of this experiment?

A) Antigen X and antigen Y have no epitopes in common
B) Antigen X and antigen Y have the same epitopes
C) Antigen Y shares most of the epitopes of antigen X
D) Antigen Y shares some of the epitopes of antigen X

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