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Are complementarity determining regions (CDRs) not the same thing as antigen-binding sites?

If not, what is the difference?

An old exam question states:

"Clarify how CDRs are related to the antigen binding sites"

To answer this I would simply say that CDRs provide a binding surface that is complementary to that of the antigen. Is that what is meant by the question or am I missing something?

All help is appreciated!

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Each antigen binding site (also known as paratope) is made up of six complementarity-determining regions (CDRs) - three from each of the light and heavy chains.

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