Arc, a master regulator of synaptic plasticity, contains sequence elements that are evolutionarily related to retrotransposon Gag genes. Two related papers in this issue of Cell show that Arc retains retroviral-like capsid-forming ability and can transmit mRNA between cells in the nervous system, a process that may be important for synaptic function.
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A Viral (Arc)hive for Metazoan Memory: Cell:
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