Purified serum antibodies elicited by immunization with protein X are adsorbed to microtiter wells. The graph shows the

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Purified serum antibodies elicited by immunization with protein X are adsorbed to microtiter wells. The graph shows the amount of radiolabeled protein X that is bound by the solid-phase anti-X antibodies in the presence of varying concentrations of protein Y With respect to the anti-X serum, which of the following interpretations regarding the epitopes expressed by proteins X and Y is correct?



A) Proteins X and Y express the same epitopes
B) Proteins X and Y have no epitopes in common
C) Protein X expresses all of the epitopes expressed by protein Y, but protein Y does not express all of the epitopes expressed by protein X
D) Protein Y expresses all of the epitopes expressed by protein X,but protein X does not express all of the epitopes expressed by protein Y