Alternative splicing of presynaptic neurexin-1 and -3 at splice site 4 is shown to regulate the receptor composition of excitatory synapses. Neurexin-1-SS4+ increases NMDA receptor responses, whereas neurexin-3-SS4+ suppresses AMPA receptor responses. Thus, presynaptic neurexin alternative splicing shapes the postsynaptic glutamate receptor composition.

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