Are antibodies the same shape?

A Typical Antibody Has Two Identical Antigen-Binding Sites

The simplest antibodies are Y-shaped molecules with two identical antigen-binding sites, one at the tip of each arm of the Y (Figure 24-18). Because of their two antigen-binding sites, they are described as bivalent.

For this reason, most of what we know about the B-cell receptor comes from the study of antibodies. Antibody molecules are roughly Y-shaped molecules consisting of three equal-sized portions, loosely connected by a flexible tether.

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