Word: celle
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...British wheeler-dealer named Dennis Loraine. What ensued was a model of transatlantic cooperation. The Swiss sent Roe to California to testify against Loraine, who got six years on counterfeiting charges; the U.S. then returned Roe, who is now serving his own six-year sentence in a Swiss cell...
...each blood cell...
...that the lactose must have prevented the represser from turning off the appropriate gene -probably because it was attracted by the represser and combined with it chemically. With a sophisticated technique, they allowed radioactive lactose-like molecules that served as tracers to be attracted by a concentrate of bacteria cell material. Isolating and analyzing the substance that had combined with the tracer molecules, they discovered that it was a large protein molecule - their long-sought "lactose represser...
Bursting Bacteria. In an equally complex experiment with the same type of bacteria cells, Harvard Molecular Biologist Mark Ptashne discovered a second represser - a smaller protein molecule that prevents the bacteria from bursting when they are attacked by viruses. Ptashne's experiment also indicated that the represser turned off the appropriate cell genes by binding itself tightly to them, somehow preventing the production of an enzyme in the process...
...discoveries, says Biophysicist Gilbert, confirm that cells of E. coli are controlled by gene-repressing agents and effectively demonstrate how simple cell mechanisms work. They may bring closer the day when scientists will be capable of genetic control of human beings, determining their characteristics and correcting metabolic defects by turning the proper genes...