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Still, “It showed that those sites are mutable in these viruses,” says Tom Peacock, an influenza virologist at the Pirbright Institute.

In the course of his restless, mutable career, Gordon, 72, has written all kinds of music, from classical pieces for solo piano or chamber orchestra to dance scores and experimental operas.

But when you take a step backwards and you look at the gameplay, a station wagon is mutable.

Godzilla belongs to Japan in the same way that, say, the Doctor of “Doctor Who” will always be British, even though that character is from a different planet and mutable in every other respect.

For decades, researchers considered mouse songs instinctual, the fixed tunes of a windup music box, rather than the mutable expressions of individual minds.