To elaborate, he used his 'transistor' to build logic circuits that program each cell's behavior. For instance, he was able to tell a cell to change color in the presence of both a specified two enzymes. Remarked Kleem (online): "Endy envisions plant-based environmental monitors, programmed tissues and even medical devices that "make Fantastic Voyage come true," (Kleem, 04.02.13).

In the first (grainy) image below, Endy's DNA "buffer gates" flash different colors according to their situation. In the image below that, we have a string of DNA -- we see the code of the a's, C's, T's and G's -- that has been programmed by synthetic biologist Eric Winfree of the California Institute of Technology --.

(Excerpted from Keim, B Computers Made Out of DNA, Slime and Other Strange Stuff

Wired. http://www.wired.com/wiredscience/2013/04/strange-computers/?pid=6598&viewall=true)

Timothy Lu, a researcher at the Massachusetts Institute of Technology, is taking this idea further by building cellular computers...
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