The protein subunit that, as one of a pair, makes up the major part of an immunoglobulin molecule.
- Each antibody molecule is composed of four subunits - two identical heavy chains and two identical light chains.
- All immunoglobulin molecules contain a light chain and a heavy chain.
- One of the tests for antibodies in the dromedary blood seemed to show an error: in addition to normal four-chain antibodies, it indicated the presence of simpler antibodies composed solely of a pair of heavy chains.
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Syllabification: heav·y chain
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