With a precise motion, Li Ma, a technician at the J. Craig Venter Institute in Rockville, MD, pipettes a cherry-red solution of bacterial cells into a vial that contains a clear solution of fragile DNA loops. These loops, the largest pieces of DNA ever assembled in the lab, are each capable of controlling all the ordinary functions of a cell. But the DNA didn't originate in any bacteria: instead, scientists pieced it together from bottled chemicals. The process they recently developed for doing this is the first to yield synthetic cells that are capable of surviving. Some of the bacterial cells that Ma is working with will fuse together in the solution, engulfing the synthetic genome and then replicating and living under its control.
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