They are trimmed by horizontally mounted, black-painted pieces that are actually three-dimensional honeycomb structures when you examine them closely.

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The University of Aberdeen has received the financial backing to develop man-made proteins closely related to structures found in sharks.

BBC: Shark

The curtilage refers to the land immediately surrounding a house or dwelling, including any closely associated buildings and structures and defines the boundary within which a home owner might reasonably expect privacy.

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Mr. Donovan and others say European leaders have missed a chance, with the Spanish bailout in particular, of using the crisis to put in place structures that tie the euro zone more closely together and thus make each country more responsible for its peers' situation.

WSJ: Greece Backs Bailout

The structures of proteins with similar functions in distantly related species are so closely alike that they could not be the determinants of their different developments.

ECONOMIST: Genetic science