Densin immunolabel is concentrated at the PSD.

Electron micrographs showing immunogold labeling of cultured hippocampal neurons using densin antibody 1. Silver-enhanced gold particles are seen as dark grains of heterogeneous size A: excitatory synapse showing intense labeling at the PSD (large arrow) with some labeling on the plasma membranes near the synapse (small arrow). B: dendritic region showing scattered labelling on the plasma membrane. Scale bar = 0.1 μm.