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for features of interest.

Structure

Immunoglobulins are composed of light chains and heavy chains. The light chain (? or ?) is a protein of ~220 amino acids, composed of a variable domain, VL (a segment of approximately 110 amino acids), and a constant domain, CL (also approximately 110 amino acids long). The u heavy chain of IgM is a protein of ~576 amino acids, includes a variable domain (VH ~110 amino acids), four distinct constant region domains (Cu1, Cu2, Cu3, Cu4, each ~110 amino acids) and a "tailpiece" of ~20 amino acids.

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