Examlex
A variety of molecular components of the adaptive immune system bind epitopes (antigenic determinants). Compare and contrast the binding of epitopes by antibody molecules, T cell receptors (TCRs), and MHC molecules, and describe the consequences of the different interactions.
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Government-provided security against foreign aggression, encompassing the military forces and other defense measures.
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A resource like air or water that is not owned by anyone, is available for everyone to use, but can become depleted if overused.
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A characteristic of a good for which it is possible to prevent individuals from enjoying its benefits unless they pay for it.
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