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Specific memories are encoded by groups of neurons called engrams.

Usually, engrams are made up of a sparse number of neurons, but the stress-induced memory engrams involved significantly more neurons.

The research focuses on engrams, which are neuronal cells in the brain that store memory information.

The researchers were able to reverse the amnesia to allow the mice to remember the lost memory using lasers to activate the engram cells.

In doing so, they identified a molecular mechanism mediated by a specific protein located in the synapse that is involved in regulating the connectivity between engram cells.