Complexes of 2 or more polypeptide chains held together by noncovalent forces (usually) but in precise ratios and with a precise 3-D configuration.
The noncovalent association of a molecule of beta-2 microglobulin with the heavy chain of each class I histocompatibility molecule is an example.Compare:
| Primary Structure |
| Secondary Structure |
| Tertiary Structure |
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