In This Issue [This Week in PNAS]

Perineuronal nets and recall of distant fear memories PNN (green) around a parvalbumin-expressing inhibitory neuron (red) in rat V2L. Perineuronal nets (PNN) are gauzy, carbohydrate-rich structures that envelop subsets of neurons in the central nervous system, forming a long-lived extracellular matrix that stabilizes synaptic connections between neurons. PNNs are thought...

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