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But Mr. Etchecolatz surrendered few secrets during a series of trials over the decades as crowds jeered him as a “killer” and “repressor,” once throwing red paint at him in 2006.

And that means that people are all of a sudden seeing, in very vivid detail, what repressors can accomplish with disinformation campaigns.

The researchers enhanced this silencing effect by hitching Cas9 to a repressor, another protein that inhibits gene expression.

In 1957, Pardee, Monod, and Jacob discovered that the lactose operon was controlled by a single master switch—a protein eventually called the repressor.

Researchers genetically altered monkeyflowers in the laboratory to observe how the two genes generate an activator molecule and a repressor molecule to produce the stunning variety of the blossoms.