A molecular cage
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A molecular cage created by designing specialized protein puzzle pieces. Every color represents a separate protein, where cylindrical segments indicate rigid parts and ribbon-like segments indicate flexible parts of each protein chain. The grey sphere in the protein cage was placed there to indicate the empty space in the middle of the container and is not part of the molecular structure.
(Credit: Todd Yeates, Yen-Ting Lai/UCLA Chemistry and Biochemistry)