<protein>

In general, the larger polypeptide in a multimeric protein. Thus the immunoglobulin heavy chain is of 50 kD, the light chain of 22 kD, whereas in myosin the heavy chain is very much larger (220 kD) than the light chains (~20 kD).

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)

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