![](https://webarchive.library.unt.edu/eot2008/20090506135413im_/http://www.nsf.gov/images/x.gif) News From the Field Caltech Scientists Control Complex Nucleation Processes Using DNA Origami Seeds
![](https://webarchive.library.unt.edu/eot2008/20090506135413im_/http://www.nsf.gov/images/greenlineshort.jpg)
April 8, 2009
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The construction of complex man-made objects--a car, say, or a pizza--almost invariably entails "top-down" processes, with the structure of the thing being built imposed from outside. Biological objects instead use a "bottom-up" approach, with order imposed from within the object being made, so it "grows" according to a built-in design.
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Source California Institute of Technology
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