[cellular_component] apical plasma membrane <sep> astrocyte projection <sep> axon <sep> axon terminus <sep> calyx of Held <sep> cell surface <sep> endoplasmic reticulum <sep> endoplasmic reticulum membrane <sep> neuronal cell body <sep> plasma membrane <sep> postsynapse <sep> Schaffer collateral - CA1 synapse <sep> voltage-gated potassium channel complex