Enzyme revives long-term memories

Boosting levels in the brain helps rats remember old times

In “Memory,” a song from the musical Cats, an aging feline invites old memories to live again. Now, that power may be in the hands of the cat’s worst enemy — the rat.

REMEMBER THE TIME Scientists are using viruses to coax brain cells to increase their output of one brain protein — called PKM-zeta — in an effort to boost rat memory.