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Complexed proteins are linked by non-covalent protein–protein interactions. These complexes function to perform many biological processes inside the cell.
The Bacillus amyloliquefaciens ribonuclease barnase (purple and yellow) and its inhibitor barstar (blue) in a complex. Regalis, Opabinia. Wikimedia Foundation, 5 Aug. 2006. Web. 17 Sept. 2016. https://commons.wikimedia.org/wiki/File:Barnase-barstar-1brs.png.