Which makes sense, given the ingredients used to preserve and give them their color are derived from petrochemicals and butane.

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Chef Clyde Nelson describes his cooking as "innovative Western, " an eclectic style that often features local ingredients given haute preparations (pan-seared tournedos of bison with a porcini demi-glace, for instance).

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Before that could happen in a useful way, however, cells would have to be given the machinery to make the ingredients themselves, rather than being spoon-fed them, as Dr Hirao and Dr Yokoyama have done.

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Even so, in a given plastic, there may be differences in ingredients, visual defects, or impurities that make it difficult to achieve the same molding characteristics, colors, strength and other properties as conventional plastics.

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