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In biochemistry, a trimer is a macromolecular complex formed by three, usually non-covalently bound, macromolecules like proteins or nucleic acids. A homo-trimer would be formed by three identical molecules. A hetero-trimer would be formed by three different macromolecules. Collagen is an example of homo-trimeric protein.
Porins usually arrange themselves in membranes as trimers.
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