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CCP at peri-PSD locations. A CCP (arrow in a) is located adjacent to the PSD (the edges of which are marked by open arrow) of a glutamatergic excitatory synapse. Similar pits (arrow in b) also exist at inhibitory synapses, where the postsynaptic membrane (area between open arrows) lacks the asymmetric density at the synaptic junction. Both synapses are sampled from perfusion-fixed mouse hippocampus. Scale bar = 100 nm
