Synaptic communication is triggered by action potentials, but neurons also talk to each other in between action potentials. Specific intracellular-calcium sensors regulate these conversations.
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Heidelberger, R. Sensors and synchronicity. Nature 450, 623–625 (2007). https://doi.org/10.1038/450623a
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DOI: https://doi.org/10.1038/450623a
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