Synapses, the connections between neurons, come in different flavors, depending on the chemical they use as transmitter. Signal transmitters, or neurotransmitters, are released at the synapse after calcium ions flow into the neuron. The type of synapses that use a signal transmitter called GABA - the GABAergic synapses—stand out because of their speed and precision. But the secret behind their speed was not fully known until now, and neither was the sensor they use to detect the inflowing calcium.
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